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10.1281 wmemchr

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/wmemchr.html

Gnulib module: wmemchr

Portability problems fixed by Gnulib:

• This function is missing on some platforms: HP-UX 11.00, IRIX 6.5, MSVC 14.

Portability problems not fixed by Gnulib:

• On Windows and 32-bit AIX platforms, wchar_t is a 16-bit type and therefore cannot accommodate all Unicode characters.