When ports-gcc optimized match(), it broke the stack frame size
calculation.  Apply the fix that Sergei Golubchik put in MariaDB's
copy of pcre.

https://bugs.exim.org/show_bug.cgi?id=2173
https://github.com/MariaDB/server/commit/440157c

Index: pcre_exec.c
--- pcre_exec.c.orig
+++ pcre_exec.c
@@ -509,6 +509,12 @@ Returns:       MATCH_MATCH if matched            )  th
                  (e.g. stopped by repeated call or recursion limit)
 */
 
+#ifdef __GNUC__
+static int
+match(REGISTER PCRE_PUCHAR eptr, REGISTER const pcre_uchar *ecode,
+  PCRE_PUCHAR mstart, int offset_top, match_data *md, eptrblock *eptrb,
+  unsigned int rdepth) __attribute__((noinline,noclone));
+#endif
 static int
 match(REGISTER PCRE_PUCHAR eptr, REGISTER const pcre_uchar *ecode,
   PCRE_PUCHAR mstart, int offset_top, match_data *md, eptrblock *eptrb,