pcre 8.30 fix, from Debian

--- src/RegExp.hpp.orig	Wed Jan 16 21:13:39 2013
+++ src/RegExp.hpp	Wed Jan 16 21:13:52 2013
@@ -7,6 +7,7 @@
 #ifndef __HPP_REGEXP
 #define __HPP_REGEXP
 
+#define MAX_SUB_EXPRESSIONS 1024
 
 // INCLUDES
 
