[PATCH] wchar.h: tweak wcwidth prototype parameter wchar_t -> wint_t

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to make it compliant with newlib and the manual page;
fixes cases of wrong width calculation:
https://cygwin.com/pipermail/cygwin/2026-April/259597.html
as mentioned in
https://cygwin.com/pipermail/cygwin/2026-May/259734.html
as described in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125451#c14

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