Add v8::jscre namespace around jscre functions to avoid link errors with jsc ...

src/third_party/jscre/pcre_tables.cpp

Index: src/third_party/jscre/pcre_tables.cpp
===================================================================
--- src/third_party/jscre/pcre_tables.cpp	(revision 848)
+++ src/third_party/jscre/pcre_tables.cpp	(working copy)
@@ -42,6 +42,8 @@
 
 #include "pcre_internal.h"
 
+namespace v8 { namespace jscre {
+
 /*************************************************
 *           Tables for UTF-8 support             *
 *************************************************/
@@ -69,3 +71,5 @@
   3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 };
 
 #include "pcre_chartables.c"
+
+} }  // namespace v8::jscre