* lib/wctype.in.h (rpl_wctype_t, wctype_t, GNULIB_defined_wctype_t):
Define if REPLACE_WCTYPE is 1.
(wctype): Consider REPLACE_WCTYPE.
(iswctype): Override also if REPLACE_WCTYPE is 1.
* lib/iswctype.c: If GNULIB_defined_wctype_t is defined, use the
function-pointer based implementation.
* m4/wctype_h.m4 (gl_WCTYPE_H_DEFAULTS): Initialize REPLACE_WCTYPE.
* m4/wctype.m4 (gl_FUNC_WCTYPE): Define through AC_DEFUN_ONCE. Test
whether wctype supports the "blank" character class. Set REPLACE_WCTYPE
if not.
* m4/iswctype.m4 (gl_FUNC_ISWCTYPE): Require gl_FUNC_WCTYPE.
* modules/wctype (Status, Notice): Remove.
(Depends-on): Add iswctype. Consider REPLACE_WCTYPE.
(configure.ac): Consider REPLACE_WCTYPE.
* modules/iswctype (Status, Notice): Remove.
(Files): Add m4/wctype.m4.
(configure.ac): Override also if REPLACE_WCTYPE is 1.
* modules/wctype-h (Makefile.am): Substitute REPLACE_WCTYPE.
* doc/posix-functions/wctype.texi: Mention the mingw bug.