Add .def file for the clang instrumented integration tests dll.

syzygy/integration_tests/integration_tests_clang_dll.def

+; Copyright 2013 Google Inc. All Rights Reserved.
+;
+; Licensed under the Apache License, Version 2.0 (the "License");
+; you may not use this file except in compliance with the License.
+; You may obtain a copy of the License at
+;
+;     http://www.apache.org/licenses/LICENSE-2.0
+;
+; Unless required by applicable law or agreed to in writing, software
+; distributed under the License is distributed on an "AS IS" BASIS,
+; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+; See the License for the specific language governing permissions and
+; limitations under the License.
+;
+; Export declarations for the test DLL.
+LIBRARY integration_tests_clang_dll.dll
+
+EXPORTS
+  ; This function is used by integration tests.
+  EndToEndTest @ 20
+