remove hack from 3.4.2

components/myguiplatform/myguirendermanager.hpp

@@ -74,11 +74,7 @@ namespace osgMyGUI
             return static_cast<RenderManager*>(MyGUI::RenderManager::getInstancePtr());
         }
 
-        bool checkTexture(MyGUI::ITexture* _texture)
+        bool checkTexture(MyGUI::ITexture* _texture) override;
-#if MYGUI_DEBUG_MODE == 1 /* needed workaround for MyGUI 3.4.2 */
-            override
-#endif
-            ;
 
         /** @see RenderManager::getViewSize */
         const MyGUI::IntSize& getViewSize() const override