Silence a recurring warning during the build to reduce noise.

--- webkitgtk-2.48.1/Source/JavaScriptCore/runtime/PropertyTable.h.orig
+++ webkitgtk-2.48.1/Source/JavaScriptCore/runtime/PropertyTable.h
@@ -201,7 +201,7 @@
     template<typename Index, typename Entry>
     void reinsert(Index*, Entry*, const ValueType& entry);
 
-    static bool canFitInCompact(const ValueType& entry) { return entry.offset() <= UINT8_MAX; }
+    static bool canFitInCompact(const ValueType& entry) { return entry.offset() <= (int)UINT8_MAX; }
 
     // Rehash the table. Used to grow, or to recover deleted slots.
     void rehash(VM&, unsigned newCapacity, bool canStayCompact);