std::mutex bug: Windows handle growth

[ASSI]

Frank Eskesen via Cygwin writes:
> I've run into a problem that occurs on Cygwin that doesn't occur on
> Linux systems: When a std::mutex is used, it doesn't clean up a
> Windows handle that it uses.

I've applied the fix provided by Corinna and built a test version on top
of the current gcc-13.4 snapshot.  Please test.

https://repo.or.cz/gcc/cygwin-gcc.git/commitdiff/f3429b7ec960fea9df62bc3c14e257d60fe436f0

The bug was already reported upstream a long time ago as FreeBSD also
has an implementation where the mutex can not be destroyed trivially:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71684

POSIX does not make such a guarantee, but there also is no feature test
macro, so it must eventually become a platform specific configuration.



Regards,
Achim.
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