steve: cocos2d-x fix warning

Author: stevetranby

cocos/base/CCScriptSupport.h

@@ -801,7 +801,7 @@ class CC_DLL ScriptEngineProtocol
 
     /** Remove proxy for a native object
      */
-    virtual void removeObjectProxy(Ref* obj) {}
+    virtual void removeObjectProxy(Ref* obj) { CC_UNUSED_PARAM(obj); }
 
     /** Triggers the garbage collector */
     virtual void garbageCollect() {}