Log Message:
libtool*: update to 2.4.7

* Noteworthy changes in release 2.4.7 (2022-03-16) [stable]

** New features:

  - Libtool script now supports (configure-time and runtime) ARFLAGS
    variable, which obsoletes AR_FLAGS.  This is due to naming conventions
    among other *FLAGS and to be consistent with Automake's ARFLAGS.

  - Gnulib testsuite is enabled and run during 'make check'.

  - Support the Windows version of the Intel C Compiler (icl) in
    libtool script.

  - Pass '-fsanitize=*' flags for GCC and LLVM, and '-specs=*' for GCC
    to linker.

  - Pass '-Xassembler=*' and '-Wa,*' flag to compilers and linkers.

  - The variable 'FILECMD' with default value of '/usr/bin/file' was used to
    replace existing hard coded references to '/usr/bin/file'.

  - Add MidnightBSD support.

** Important incompatible changes:

  - Libtool changed ARFLAGS/AR_FLAGS default from 'cru' to 'cr'.

  - Do not pass '-pthread' to Solaris linker.

  - 'libtool' and 'libtoolize' scripts now use '#! /usr/bin/env sh' shebang.
    Previously '#! /bin/sh' was used, which presents challenges for
    containerized environments.

** Bug fixes:

  - Fix significant slowdown of libtoolize for certain projects (regression
    introduced in 2.4.3 release) caused by infinite m4 macro recursion.

  - Mitigate the slowdown of libtool script (introduced in v2.4.3) caused by
    increased number of calls to '$SED $sed_quote_subst' (bug#20006).

  - Properly parse and export TLS symbols on AIX.

  - Various bug fixes surrounding use of 'sed'.

  - Darwin systems set proper "allow undefined" flag on OSX 11, and
    PowerPC 10.5.

  - Removed some deprecated tests related to 'Makefile.inc' files.