Now that we have locale_t, we can use the musl versions of these functions.
This also fixes a licensing issue: the strptime implementation had an
advertising clause (although in upstream *BSD it was removed, so we
likely could have managed to remove it anyway.)
Implemented the missing POSIX functions in <locale.h>:
newlocale, duplocale, uselocale, and freelocale, and also
provided missing type definitions for <locale.h>.
Implemented missing POSIX locale-based function variants.
Modified LocaleBackend so that it could support thread-local
locales.
Some glibc-like locale-related variables supporting
ctype and printf family of functions have also been updated
to reflect the thread-local variables present in the latest
glibc sources.
As there have been some modifications to global symbols
in libroot, libroot_stubs.c has been regenerated.
Bug: #17168
Change-Id: Ibf296c58c47d42d1d1dfb2ce64042442f2679431
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5351
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>
