update gitignore

3rdpart/OpenCV/include/opencv2/gapi/render.hpp

@@ -1,14 +0,0 @@
-// This file is part of OpenCV project.
-// It is subject to the license terms in the LICENSE file found in the top-level directory
-// of this distribution and at http://opencv.org/license.html.
-//
-// Copyright (C) 2019 Intel Corporation
-
-#ifndef OPENCV_GAPI_RENDER_ROOT_HPP
-#define OPENCV_GAPI_RENDER_ROOT_HPP
-
-// This file is just a shortcut to render/render.hpp
-
-#include <opencv2/gapi/render/render.hpp>
-
-#endif // OPENCV_GAPI_RENDER_ROOT_HPP