Log message:
(math/nlopt) Updated 2.6.2 to 2.7.1

NLopt 2.7.1
* Various minor bugfixes (#268, #409, #420) and build
* improvements (support Octave 6.x, Guile 3.x, Cmake 3.2).

NLopt 2.7.0
* New nlopt_set_param API for setting internal algorithm parameters
  ([#365]).
* Avoid library-symbol conflicts ([#355], [#361])

Log message:
math: Replace RMD160 checksums with BLAKE2s checksums

All checksums have been double-checked against existing RMD160 and
SHA512 hashes

Log message:
math: Remove SHA1 hashes for distfiles

Log message:
(math/nlopt)  Updated 2.4.2 to 2.6.2

# NLopt Release Notes

## NLopt 2.6.2

15 April 2020

* Fixed forced stop exception with dimension elimination ([#317])

* Fixed `get_initial_step` wrapping ([#319])

* Various build fixes ([#314], [#308], [#303], [#278])

## NLopt 2.6.1

13 April 2019

* Fix `nlopt_version` result for 2.6.x and update soname.

## NLopt 2.6

12 April 2019

* New `nlopt_set_upper_bound` and `nlopt_set_lower_bound` functions in the \ 
low-level C API to set one bound at a time ([#257]).

* There is no longer a separate `libnlopt_cxx` library: C++ algorithms (STOGO \ 
and AGS) are compiled and included by default ([#198]).

* Various build fixes ([#197], [#216], [#245], [#250], [#230], [#261], etc.), \ 
other fixes ([#242], [#258]).

## NLopt 2.5

26 July 2018

* New AGS global solver ([#194]), thanks to Vladislav Sovrasov.

* New `nlopt_get_numevals` function providing a built-in evaluation counter ([#160]).

* New `nlopt_get_errmsg` function for more descriptive error messages.

* Build system is converted to `cmake` ([#49]), thanks to Julien Schueller

* Plugins updated for recent Octave and Guile versions.

* Various other build fixes and minor bug fixes.

Log message:
Fix indentation in buildlink3.mk files.

The actual fix as been done by "pkglint -F */*/buildlink3.mk", and was
reviewed manually.

There are some .include lines that still are indented with zero spaces
although the surrounding .if is indented. This is existing practice.

Log message:
Extend SHA512 checksums to various files I have on my local distfile
mirror.

Log message:
Import nlopt-2.4.2 as math/nlopt.

NLopt is a free/open-source library for nonlinear optimization,
providing a common interface for a number of different free optimization
outines available online as well as original implementations of various
other algorithms.

Its features include:
- Callable from C, C++, Fortran, Matlab or GNU Octave, Python,
  GNU Guile, Julia, GNU R, Lua, and OCaml.
- A common interface for many different algorithms -- try a different
  algorithm just by changing one parameter.
- Support for large-scale optimization (some algorithms scalable to
  millions of parameters and thousands of constraints).
- Both global and local optimization algorithms.
- Algorithms using function values only (derivative-free) and also
  algorithms exploiting user-supplied gradients.
- Algorithms for unconstrained optimization, bound-constrained
  optimization, and general nonlinear inequality/equality constraints.

Reviewed by:	wiz@