fnmatch.c: use MB_CUR_MAX from stdlib.h included earlier

Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>

libc/misc/fnmatch/fnmatch.c

@@ -334,11 +334,6 @@ is_char_class (const wchar_t *wcs)
 #  include "fnmatch_loop.c"
 # endif
 
-#ifndef __UCLIBC_HAS_WCHAR__
-# undef MB_CUR_MAX
-# define MB_CUR_MAX 1
-#endif
-
 int
 fnmatch (const char *pattern, const char *string, int flags)
 {