* lib/.cppi-disable: Add wcwidth.

* lib/.cppi-disable: Add wcwidth.
* lib/fnmatch.c (ISBLANK): Remove.  All uses changed to isblank.
(isblank) [! (defined isblank || HAVE_DECL_ISBLANK)]: New macro.
(ISGRAPH): Remove.  All uses changed to isgraph.
(FOLD) [!defined _LIBC]: Remove special case.
* lib/getdate.y (lookup_word): Remove no-longer-needed call to islower.
* lib/regext_internal.h (isblank): Depend on HAVE_DECL_ISBLANK, not
HAVE_ISBLANK.
* lib/strftime.c (TOLOWER, TOUPPER) [!defined _LIBC]: Remove special case.

* m4/fnmatch.m4 (_AC_LIBOBJ_FNMATCH): Don't check for getenv decl;
no longer needed.  Check for isblank decl.
* m4/mkstemp.m4 (gl_PREREQ_TEMPNAME): Don't check for getenv decl.
* m4/regex.m4 (gl_PREREQ_REGEX): Dheck for isblank decl instead
of existence.