fnmatch: rely on more gnulib modules

[Bruno Haible]

The 'fnmatch' module currently tests for wmemcpy() differently than wmemcpy.m4
does. It also lacks the workarounds from the 'btowc' and 'iswctype' modules.

Therefore here is a proposed patch to let this module use more from gnulib.
Accordingly, the code becomes simpler.

Paul, is this OK from the perspective of a future merge with glibc?


2020-05-29  Bruno Haible  <bruno@clisp.org>

        fnmatch: Rely on more gnulib modules.
        * modules/fnmatch (Depends-on): Add btowc, isblank, iswctype, wmemchr,
        wmempcpy, mempcpy.
        * lib/fnmatch.c: Assume that HAVE_WCTYPE_H, HAVE_BTOWC, HAVE_ISWCTYPE,
        HAVE_WMEMCHR, HAVE_WMEMPCPY, HAVE_ISBLANK, HAVE_DECL_ISBLANK,
        HAVE_MEMPCPY are all 1.
        * m4/fnmatch.m4 (gl_PREREQ_FNMATCH): Don't test for btowc, isblank,
        iswctype, mempcpy, wmemchr, wmemcpy, wmempcpy, <wctype.h>.

0001-fnmatch-Rely-on-more-gnulib-modules.patch
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