Log Message:
math/openblas: update to version 0.3.15

This includes a rework of our patchery with the hope of upstreaming a good deal
of it.

These are the upstream changes since 0.3.10:

Version 0.3.15
  2-May-2021

common:
 - imported improvements and bugfixes from Reference-LAPACK 3.9.1
 - imported LAPACKE interface fixes from Reference-LAPACK PRs 534 + 537
 - fixed a problem in the cpu detection of 0.3.14 that prevented cross-compilation
 - fixed a sequence problem in the generation of softlinks to the library in GMAKE

RISC V:
 - fixed compilation on RISCV (missing entry in getarch)
 - fixed a potential division by zero in CROTG and ZROTG

POWER:
 - fixed LAPACK testsuite failures seen with the NVIDIA HPC compiler
 - improved CGEMM, DGEMM and ZGEMM performance on POWER10
 - added an optimized ZGEMV kernel for POWER10
 - fixed a potential division by zero in CROTG and ZROTG

x86_64:
 - added support for Intel Control-flow Enforcement Technology (CET)
 - reverted the DOMATCOPY_RT code to the generic C version
 - fixed a bug in the AVX512 SGEMM kernel introduced in 0.3.14
 - fixed misapplication of -msse flag to non-SSE cpus in DYNAMIC_ARCH
 - added support for compilation of the benchmarks on older OSX versions
 - fix propagation of the NO_AVX512 option in CMAKE builds
 - fix compilation of the AVX512 SGEMM kernel with clang-cl on Windows
 - fixed compilation of the CTESTs with INTERFACE64=1 (random faults on OSX)
 - corrected the Haswell DROT kernel to require AVX2/FMA3 rather than AVX512

ARM:
 - fixed a potential division by zero in CROTG and ZROTG
 - fixed a potential overflow in IMATCOPY/ZIMATCOPY and the CTESTs

ARM64:
 - fixed spurious reads outside the array in the SGEMM tcopy macro
 - fixed a potential division by zero in CROTG and ZROTG
 - fixed a segmentation fault in DYNAMIC_ARCH builds (reappeared in 0.3.14)

MIPS
 - fixed a potential division by zero in CROTG and ZROTG
 - fixed a potential overflow in IMATCOPY/ZIMATCOPY and the CTESTs

MIPS64:
 - fixed a potential division by zero in CROTG and ZROTG

SPARC:
 - fixed a potential division by zero in CROTG and ZROTG

====================================================================
Version 0.3.14
 17-Mar-2021

 common:
	* Fixed a race condition on thread shutdown in non-OpenMP builds
	* Fixed custom BUFFERSIZE option getting ignored in gmake builds
	* Fixed CMAKE compilation of the TRMM kernels for GENERIC platforms
	* Added CBLAS interfaces for CROTG, ZROTG, CSROT and ZDROT
	* Improved performance of OMATCOPY_RT across all platforms
	* Changed perl scripts to use env instead of a hardcoded /usr/bin/perl
	* Fixed potential misreading of the GCC compiler version in the build scripts
	* Fixed convergence problems in LAPACK complex GGEV/GGES (Reference-LAPACK #477)
	* Reduced the stacksize requirements for running the LAPACK testsuite \ 
(Reference-LAPACK #335)

 RISCV:
 	* Fixed compilation on RISCV (missing entry in getarch)

 POWER:
 	* Fixed compilation for DYNAMIC_ARCH with clang and with old gcc versions
	* Added support for compilation on FreeBSD/ppc64le
 	* Added optimized POWER10 kernels for SSCAL, DSCAL, CSCAL, ZSCAL
	* Added optimized POWER10 kernels for SROT, DROT, CDOT, SASUM, DASUM
	* Improved SSWAP, DSWAP, CSWAP, ZSWAP performance on POWER10
	* Improved SCOPY and CCOPY performance on POWER10
	* Improved SGEMM and DGEMM performance on POWER10
	* Added support for compilation with the NVIDIA HPC compiler

 x86_64:
	* Added an optimized bfloat16 GEMM kernel for Cooperlake
	* Added CPUID autodetection for Intel Rocket Lake and Tiger Lake cpus
	* Improved the performance of SASUM,DASUM,SROT,DROT on AMD Ryzen cpus
	* Added support for compilation with the NAG Fortran compiler
	* Fixed recognition of the AMD AOCC compiler
	* Fixed compilation for DYNAMIC_ARCH with clang on Windows
	* Added support for running the BLAS/CBLAS tests on Windows
	* Fixed signatures of the tls callback functions for Windows x64
	* Fixed various issues with fma intrinsics support handling

 ARM:
	* Added support for embedded Cortex M targets via a new option EMBEDDED

 ARMV8:
 	* Fixed the THUNDERX2T99 and NEOVERSEN1 DNRM2/ZNRM2 kernels for inputs with Inf
	* Added support for the DYNAMIC_LIST option
	* Added support for compilation with the NVIDIA HPC compiler
 	* Added support for compiling with the NAG Fortran compiler

====================================================================
Version 0.3.13
 12-Dec-2020

 common:
	* Added a generic bfloat16 SBGEMV kernel
	* Fixed a potentially severe memory leak after fork in OpenMP builds
	  that was introduced in 0.3.12
	* Added detection of the Fujitsu Fortran compiler
	* Added detection of the (e)gfortran compiler on OpenBSD
	* Added support for overriding the default name of the library independently
	  from symbol suffixing in the gmake builds (already supported in cmake)

RISCV:
	* Added a RISC V port optimized for C910V

POWER:
	* Added optimized POWER10 kernels for SAXPY, CAXPY, SDOT, DDOT and DGEMV_N
	* Improved DGEMM performance on POWER10
	* Improved STRSM and DTRSM performance on POWER9 and POWER10
	* Fixed segmemtation faults in DYNAMIC_ARCH builds
 	* Fixed compilation with the PGI compiler

x86:
	* Fixed compilation of kernels that require SSE2 intrinsics since 0.3.12

x86_64:
	* Added an optimized bfloat16 SBGEMV kernel for SkylakeX and Cooperlake
	* Improved the performance of SASUM and DASUM kernels through parallelization
	* Improved the performance of SROT and DROT kernels
	* Improved the performance of multithreaded xSYRK
	* Fixed OpenMP builds that use the LLVM Clang compiler together with GNU gfortran
	  (where linking of both the LLVM libomp and GNU libgomp could lead to lockups or
	  wrong results)
	* Fixed miscompilations by old gcc 4.6
	* Fixed misdetection of AVX2 capability in some Sandybridge cpus
	* Fixed lockups in builds combining DYNAMIC_ARCH with TARGET=GENERIC on OpenBSD

ARM64:
	* Fixed segmemtation faults in DYNAMIC_ARCH builds

MIPS:
	* Improved kernels for Loongson 3R3 ("3A") and 3R4 ("3B") \ 
models, including MSA
	* Fixed bugs in the MSA kernels for CGEMM, CTRMM, CGEMV and ZGEMV
	* Added handling of zero increments in the MSA kernels for SSWAP and DSWAP
	* Added DYNAMIC_ARCH support for MIPS64 (currently Loongson3R3/3R4 only)

SPARC:
	* Fixed building 32 and 64 bit SPARC kernels with the SolarisStudio compilers

====================================================================
Version 0.3.12
 24-Oct-2020

common:
	* Fixed missing BLAS/LAPACK functions (inadvertently dropped during
	  the build system restructuring)
	* Fixed argument conversion macro in LAPACKE_zgesvdq (LAPACK #458)

POWER:
	* Added optimized SCOPY/CCOPY kernels for POWER10
	* Increased and unified the default size of the GEMM BUFFER
	* Fixed building for POWER10 in DYNAMIC_ARCH mode
	* POWER10 compatibility test now checks binutils version as well
	* Cleaned up compiler warnings

x86_64:
	* corrected compiler version checks for AVX2 compatibility
	* added compiler option -mavx2 for building with flang
	* fixed direct SGEMM pathway for small matrix sizes (broken by
	  the code refactoring in 0.3.11)
	* fixed unhandled partial register clobbers in several kernels
	  for AXPY,DOT,GEMV_N and GEMV_T flagged by gcc10 tree-vectorizer

ARMV8:
	* improved Apple Vortex support to include cross-compiling

====================================================================
Version 0.3.11
 17-Oct-2020

common:
 	* API change:
	  the newly added BFLOAT16 functions were renamed to use the
	  letter "B" instead of "H" to avoid potential confusion with
	  the IEEE "half precision float" type, i.e. the 0.3.10
	  SHGEMM is now SBGEMM and the corresponding build option
	  was changed from "BUILD_HALF" to "BUILD_BFLOAT16".
	* Reduced the default BLAS3_MEM_ALLOC_THRESHOLD (used as an upper
	  limit for placing temporary arrays on the stack) to be compatible
	  with a stack size of 1mb (as imposed by the JAVA runtime library)
	* Added mixed-precision dot function SBDOT and utility functions
	  shstobf16, shdtobf16, sbf16tos and dbf16tod to convert between
	  single or double precision float arrays and bfloat16 arrays
	* Fixed prototypes of LAPACK_?ggsvp and LAPACK_?ggsvd functions
	  in lapack.h
	* Fixed underflow and rounding errors in LAPACK SLANV2 and DLANV2
	  (causing miscalculations in e.g. SHSEQR/DHSEQR, LAPACK issue #263)
	* Fixed workspace calculation in LAPACK ?GELQ (LAPACK issue #415)
	* Fixed several bugs in the LAPACK testsuite
	* Improved performance of TRMM and TRSM for certain problem sizes
	* Fixed infinite recursions and workspace miscalculations in ReLAPACK
	* CMAKE builds no longer require pkg-config for creating the .pc file
	* Makefile builds no longer misread NO_CBLAS=0 or NO_LAPACK=0 as
	  enabling these options
	* Fixed detection of gfortran when invoked through an mpi wrapper
	* Improve thread reinitialization performance with OpenMP after a fork
	* Added support for building only the subset of the library required
	  for a particular precision by specifying BUILD_SINGLE, BUILD_DOUBLE
	* Optional function name prefixes and suffixes are now correctly
	  reflected in the generated cblas.h
	* Added CMAKE build support for the LAPACK and multithreading tests

POWER:
	* Added optimized support for POWER10
	* Added support for compiling for POWER8 in 32bit mode
	* Added support for compilation with LLVM/clang
	* Added support for compilation with NVIDIA/PGI compilers
	* Fixed building on big-endian POWER8
	* Fixed miscompilation of ZDOTC by gcc10
	* Fixed alignment errors in the POWER8 SAXPY kernel
	* Improved CPU detection on AIX
	* Supported building with older compilers on POWER9

x86_64:
	* Added support for Intel Cooperlake
	* Added autodetection of AMD Renoir/Matisse/Zen3 cpus
	* Added autodetection of Intel Comet Lake cpus
	* Reimplemented ?sum, ?dot and daxpy using universal intrinsics
	* Reset the fpu state before using the fpu on Windows as a workaround
	  for a problem introduced in Windows 10 build 19041 (a.k.a. SDK 2004)
	* Fixed potentially undefined behaviour in the dot and gemv_t kernels
	* Fixed a potential segmentation fault in DYNAMIC_ARCH builds
	* Fixed building for ZEN with PGI/NVIDIA and AMD AOCC compilers

ARMV7:
	* Fixed cpu detection on BSD-like systems

ARMV8:
	* Added preliminary support for Apple Vortex cpus
	* Added support for the Cavium ThunderX3T110 cpu
	* Fixed cpu detection on BSD-like systems
	* Fixed compilation in -std=C18 mode

IBM Z:
	* Added support for compiling with the clang compiler
	* Improved GEMM performance on Z14