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

src/third_party/jscre/pcre_xclass.cpp

Index: src/third_party/jscre/pcre_xclass.cpp
===================================================================
--- src/third_party/jscre/pcre_xclass.cpp	(revision 848)
+++ src/third_party/jscre/pcre_xclass.cpp	(working copy)
@@ -42,6 +42,8 @@
 
 #include "pcre_internal.h"
 
+namespace v8 { namespace jscre {
+
 /*************************************************
 *       Match character against an XCLASS        *
 *************************************************/
@@ -112,3 +114,5 @@
     
     return negated;   /* char did not match */
 }
+
+} }  // namespace v8::jscre