some mbrtoc32 related tweaks

[Bruno Haible]

A couple of tiny tweaks related to mbrtowc and mbrtoc32.


2023-06-28  Bruno Haible  <bruno@clisp.org>

        c32*: Update comment.
        * lib/c32is-impl.h (FUNC): Add comment regarding Android.
        * lib/c32to-impl.h (FUNC): Likewise.
        * lib/c32width.c (c32width): Likewise.

2023-06-28  Bruno Haible  <bruno@clisp.org>

        mbrtoc32: Doc tweak.
        * doc/posix-functions/mbrtoc32.texi: Mention that mingw and Android have
        the empty input bug.
        * m4/mbrtoc32.m4 (gl_MBRTOC32_EMPTY_INPUT): Update cross-compilation
        guess.

2023-06-28  Bruno Haible  <bruno@clisp.org>

        mbrtowc: Doc tweak.
        * doc/posix-functions/mbrtowc.texi: Mention that MSVC has the empty
        input bug and the return value bug. Mention that Android has the empty
        input bug.
        * m4/mbrtowc.m4 (gl_MBRTOC32_EMPTY_INPUT): Update cross-compilation
        guess.

2023-06-28  Bruno Haible  <bruno@clisp.org>

        mbrtowc, mbrtoc32: Simplify autoconf macros.
        * m4/mbrtowc.m4 (gl_MBRTOWC_EMPTY_INPUT, gl_MBRTOWC_C_LOCALE): Put
        cross-compilation guess at the usual place.
        * m4/mbrtoc32.m4 (gl_MBRTOC32_EMPTY_INPUT, gl_MBRTOC32_C_LOCALE):
        Likewise.

0001-mbrtowc-mbrtoc32-Simplify-autoconf-macros.patch
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0002-mbrtowc-Doc-tweak.patch
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0003-mbrtoc32-Doc-tweak.patch
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0004-c32-Update-comment.patch
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