regex: Remove obsolete patch

glib/update-pcre/Makefile.am

@@ -5,5 +5,4 @@ EXTRA_DIST += 			\
 	Makefile.am-1		\
 	Makefile.am-2		\
 	digitab.patch		\
-	memory.patch		\
-	pcre_valid_utf8.c
+	memory.patch

glib/update-pcre/pcre_valid_utf8.c

@@ -1,14 +0,0 @@
-#include "config.h"
-#include "pcre_internal.h"
-
-/*
- * This function is not needed by GRegex, so print an error and
- * return always -1, that is the string is a valid UTF-8 encoded
- * string.
- */
-int
-_pcre_valid_utf8(const uschar *string, int length)
-{
-g_warning ("%s: this function should not be called", G_STRLOC);
-return -1;
-}