Reasonably safe changes.

Using accessor for vertexbuffer in LLFace
Extra occlusion query lookup in llgl (unused)
Const changes.

indra/newview/llhudobject.h

@@ -106,6 +106,7 @@ protected:
 	~LLHUDObject();
 
 	virtual void render() = 0;
+	virtual void renderForSelect() {}	//Only override when needed.
 	virtual void renderForTimer() {};
 	
 protected: