* MODULES.html.sh: New module wctype. * lib/wctype_.h, m4/wctype.m4, modules/wctype: New files. * lib/fnmatch.c: Don't bother to include <wchar.h> before <wctype.h>, since the new wctype module should fix this. * lib/quotearg.c: Include <wctype.h> unconditionally, since the wctype module should arrange for it. * lib/regex_internal.h: Likewise. * m4/quotearg.m4 (gl_QUOTEARG): Don't check for wctype.h or iswprint, since the wctype module should handle this now. * m4/regex.m4 (gl_PREREQ_REGEX): Don't check for wctype.h. * modules/fnmatch (Depends-on): Add wctype. * modules/quotearg (Depends-on): Likewise. * modules/regex (Depends-on): Likewise.