[PATCH 1/3] Merge _GL_UNUSED C23 patch from Gnulib

[Florian Weimer]

* Paul Eggert:

> * posix/getopt.c (_getopt_initialize):
> * sysdeps/posix/tempname.c (try_dir, try_nocreate):
> Put _GL_UNUSED before args instead of after.
> This makes no difference for glibc.
> It is needed for Gnulib when being compiled on
> non-GCC C23 compilers.

This looks okay.

Reviewed-by: Florian Weimer <fweimer@redhat.com>

Thanks,
Florian