[9778] Old gcc hash_map not have support for std::string keys.

In different from tr1 unordered_map

Signed-off-by: VladimirMangos <vladimir@getmangos.com>

src/framework/Utilities/UnorderedMap.h

@@ -64,6 +64,13 @@ namespace __gnu_cxx
         size_t operator()(T * const &__x) const { return (size_t)__x; }
     };
 
+    template<> struct hash<std::string>
+    {
+        size_t operator()(const std::string &__x) const
+        {
+            return hash<const char *>()(__x.c_str());
+        }
+    };
 };
 
 #else