New module 'wctype'. * modules/wctype: Change to represent the wctype() substitute. * lib/wctype.in.h (wctype): New declaration. * lib/wctype.c: New file. * lib/wctype-impl.h: New file. * m4/wctype.m4: New file. * m4/wctype_h.m4 (gl_WCTYPE_H): Test whether wctype is declared. (gl_WCTYPE_H_DEFAULTS): Initialize GNULIB_WCTYPE. * modules/wctype-h (Makefile.am): Substitute GNULIB_WCTYPE. * tests/test-wctype-h-c++.cc: Test the declaration of wctype. * doc/posix-functions/wctype.texi: Mention the new module and the HP-UX 11.00 problem.