Add license header to no_op.cc.

TBR=niklas.enbom@webrtc.org
BUG=chromium98592
TEST=none

Review URL: https://webrtc-codereview.appspot.com/717004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@2539 4adac7df-926f-26a2-2b94-8c16560cd09d

src/build/no_op.cc

@@ -1,3 +1,14 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// No-op main() to provide a dummy executable target.
 int main() {
   return 0;
 }