Disabled external gits

cs440-acg/ext/tbb/examples/common/gui/dxcheck.bat

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+@echo off
+REM
+REM Copyright (c) 2005-2020 Intel Corporation
+REM
+REM Licensed under the Apache License, Version 2.0 (the "License");
+REM you may not use this file except in compliance with the License.
+REM You may obtain a copy of the License at
+REM
+REM     http://www.apache.org/licenses/LICENSE-2.0
+REM
+REM Unless required by applicable law or agreed to in writing, software
+REM distributed under the License is distributed on an "AS IS" BASIS,
+REM WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+REM See the License for the specific language governing permissions and
+REM limitations under the License.
+REM
+if "%DXSDK_DIR%"=="" goto error_no_DXSDK
+goto end
+
+:error_no_DXSDK
+echo DirectX SDK Check : error : This example requires the DirectX SDK.  Either (re)-install the DirectX SDK, or set the DXSDK_DIR environment variable to indicate where it is installed.
+
+:end
+