Enable the -Wundef warning for clang

webrtc/common_audio/signal_processing/real_fft_unittest.cc

 /*
  *  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.
  */
 
 #include "webrtc/common_audio/signal_processing/include/real_fft.h"
 #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
 #include "webrtc/typedefs.h"
 

[kjellander_webrtc, 2016/09/23 12:32:37]

remove blank line + sort

-#include "testing/gtest/include/gtest/gtest.h"
+#include "webrtc/base/gtest.h"
 
 namespace webrtc {
 namespace {
 
 // FFT order.
 const int kOrder = 5;
 // Lengths for real FFT's time and frequency bufffers.
 // For N-point FFT, the length requirements from API are N and N+2 respectively.
 const int kTimeDataLength = 1 << kOrder;
 const int kFreqDataLength = (1 << kOrder) + 2;
@@ skipping 72 matching lines @@
   EXPECT_EQ(real_scale, complex_scale);
   for (i = 0, j = 0; i < kTimeDataLength; i += 1, j += 2) {
     EXPECT_LE(abs(real_fft_time[i] - complex_fft_buff[j]), 1);
   }
 
   WebRtcSpl_FreeRealFFT(fft);
 }
 
 }  // namespace
 }  // namespace webrtc