* lib/memcasecmp.c: Include <limits.h>.
(memcasecmp): Don't assume UCHAR_MAX <= INT_MAX.
* lib/strtod.c (strtod): Don't assume isspace works on negative chars.
Don't assume isdigit succeeds only on '0' through '9'.
* lib/exclude.c (IN_CTYPE_DOMAIN, is_space): Remove; no longer needed.
All uses of is_space replaced by isspace.
* lib/fnmatch.c (ISASCII): Remove; no longer needed. All uses removed.
(ISPRINT, ISDIGIT, ISALNUM, ISALPHA, ISCNTRL, ISLOWER, ISPUNCT):
(ISSPACE, ISUPPER, ISXDIGIT): Remove; no longer needed. All uses
replaced by isprint etc.
* lib/getdate.y (IN_CTYPE_DOMAIN, ISSPACE, ISALPHA, ISLOWER): Likewise.
* lib/getusershell.c (IN_CTYPE_DOMAIN, ISSPACE): Likewise.
* lib/memcasecmp.c (IN_CTYPE_DOMAIN, ISLOWER, TOUPPER): Likewise.
* lib/strtod.c (IN_CTYPE_DOMAIN, ISSPACE, ISDIGIT, TOLOWER): Likewise.
* lib/strtol.c (IN_CTYPE_DOMAIN): Likewise.
* lib/xstrtol.c (IN_CTYPE_DOMAIN, ISSPACE): Likewise.