doc: mention more functions added in cygwin 1.7.0 * doc/posix-functions/abort.texi (abort): Update wording related to cygwin. * doc/posix-functions/daylight.texi (daylight): Likewise. * doc/posix-functions/optarg.texi (optarg): Likewise. * doc/posix-functions/optarg.texi (opterr): Likewise. * doc/posix-functions/optarg.texi (optind): Likewise. * doc/posix-functions/optarg.texi (optopt): Likewise. * doc/posix-functions/wprintf.texi (wprintf): Cygwin wprintf never worked in 1.5.x, and was withdrawn in 1.7. * doc/posix-functions/vwprintf.texi (vwprintf): Likewise. * doc/posix-functions/fprintf.texi (fprintf): Tighten mention of cygwin versions. * doc/posix-functions/perror.texi (perror): Likewise. * doc/posix-functions/printf.texi (printf): Likewise. * doc/posix-functions/snprintf.texi (snprintf): Likewise. * doc/posix-functions/sprintf.texi (sprintf): Likewise. * doc/posix-functions/vfprintf.texi (vfprintf): Likewise. * doc/posix-functions/vprintf.texi (vprintf): Likewise. * doc/posix-functions/vsnprintf.texi (vsnprintf): Likewise. * doc/posix-functions/vsprintf.texi (vsprintf): Likewise. * doc/glibc-functions/obstack_printf.texi (obstack_printf): Likewise. * doc/glibc-functions/obstack_vprintf.texi (obstack_vprintf): Likewise. * doc/glibc-functions/cfmakeraw.texi (cfmakeraw): Cygwin 1.7 adds this function. * doc/glibc-functions/in6addr_any.texi (in6addr_any): Likewise. * doc/glibc-functions/in6addr_loopback.texi (in6addr_loopback): Likewise. * doc/glibc-functions/updwtmpx.texi (updwtmpx): Likewise. * doc/posix-functions/_Exit_C99.texi (_Exit): Likewise. * doc/posix-functions/confstr.texi (confstr): Likewise. * doc/posix-functions/dprintf.texi (dprintf): Likewise. * doc/posix-functions/fgetwc.texi (fgetwc): Likewise. * doc/posix-functions/fgetws.texi (fgetws): Likewise. * doc/posix-functions/fputwc.texi (fputwc): Likewise. * doc/posix-functions/fputws.texi (fputws): Likewise. * doc/posix-functions/fwide.texi (fwide): Likewise. * doc/posix-functions/getwc.texi (getwc): Likewise. * doc/posix-functions/getwchar.texi (getwchar): Likewise. * doc/posix-functions/putwc.texi (putwc): Likewise. * doc/posix-functions/putwchar.texi (putwchar): Likewise. * doc/posix-functions/sigignore.texi (sigignore): Likewise. * doc/posix-functions/ungetwc.texi (ungetwc): Likewise. * doc/posix-functions/vdprintf.texi (vdprintf): Likewise. * doc/posix-functions/wcpcpy.texi (wcpcpy): Likewise. * doc/posix-functions/wcpncpy.texi (wcpncpy): Likewise. * doc/posix-functions/wcstol.texi (wcstol): Likewise. * doc/posix-functions/wcstoll.texi (wcstoll): Likewise. * doc/posix-functions/wcstoul.texi (wcstoul): Likewise. * doc/posix-functions/wcstoull.texi (wcstoull): Likewise. * doc/posix-functions/wcsxfrm.texi (wcsxfrm): Likewise. Signed-off-by: Eric Blake <ebb9@byu.net>