Update.

Update.

	* posix/tst-fnmatch.input: Add test case for FNM_PERIOD handling with
	FNM_EXTMATCH.

	* posix/fnmatch_loop.c: Optimize handling of ?() and @().
	* posix/fnmatch.c: Define STRLEN and STRCAT appropriately.

	* posix/Versions [libc] (GLIBC_2.2.3): Add fnmatch.
	* posix/fnmatch.c: Define with new default version GLIBC_2.2.3 to
	avoid running binaries with libc versions without FNM_EXTMATCH support.

	* include/wchar.h: Add prototype for __wcscat.
	* wcsmbs/wcscat.c: Define __wcscat and make wcscat weak alias.