Enable the -Wundef warning for clang

webrtc/test/test.gyp

 # Copyright (c) 2011 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.
 
 # TODO(andrew): consider moving test_support to src/base/test.
 {
@@ skipping 60 matching lines @@
         '<(webrtc_root)/system_wrappers/system_wrappers.gyp:metrics_default',
       ],
     },
     {
       'target_name': 'test_support',
       'type': 'static_library',
       'dependencies': [
         '<(DEPTH)/testing/gtest.gyp:gtest',
         '<(DEPTH)/testing/gmock.gyp:gmock',
         '<(webrtc_root)/base/base.gyp:gtest_prod',
+        '<(webrtc_root)/base/base.gyp:rtc_base_approved',
         '<(webrtc_root)/common_video/common_video.gyp:common_video',
         '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers',
       ],
       'sources': [
+        'gmock.h',
+        'gtest.h',
         'testsupport/fileutils.cc',
         'testsupport/fileutils.h',
         'testsupport/frame_reader.cc',
         'testsupport/frame_reader.h',
         'testsupport/frame_writer.cc',
         'testsupport/frame_writer.h',
         'testsupport/iosfileutils.mm',
         'testsupport/metrics/video_metrics.h',
         'testsupport/metrics/video_metrics.cc',
         'testsupport/mock/mock_frame_reader.h',
@@ skipping 188 matching lines @@
                '-framework OpenGL',
                '-framework CoreVideo',
              ],
            },
          }],
        ],
      },
     },
   ],
 }