Added build flag around the Intelligibility enhancer performance test code

webrtc/modules/audio_processing/audio_processing_performance_unittest.cc

Index: webrtc/modules/audio_processing/audio_processing_performance_unittest.cc
diff --git a/webrtc/modules/audio_processing/audio_processing_performance_unittest.cc b/webrtc/modules/audio_processing/audio_processing_performance_unittest.cc
index 5309a6a42fc0b1389b53856966ec8f80148c0c95..aea8d92a83779ab3ee7c64aec0d68e3e20b2f2fb 100644
--- a/webrtc/modules/audio_processing/audio_processing_performance_unittest.cc
+++ b/webrtc/modules/audio_processing/audio_processing_performance_unittest.cc
@@ -96,6 +96,7 @@ struct SimulationConfig {
       }
     }
 
+#if (WEBRTC_INTELLIGIBILITY_ENHANCER == 1)

[ivoc, 2016/08/31 08:45:45]

Does this work if the flag is not set at all? Or is that not supposed to happen?

[peah-webrtc, 2016/08/31 12:42:46]

That is a very good point! I put it like this in order not to clutter the test,
but I'll add a proper check as well.

     const SettingsType intelligibility_enhancer_settings[] = {
         SettingsType::kDefaultApmDesktopAndIntelligibilityEnhancer};
 
@@ -107,6 +108,7 @@ struct SimulationConfig {
         simulation_configs.push_back(SimulationConfig(sample_rate, settings));
       }
     }
+#endif
 
     const SettingsType beamformer_settings[] = {
         SettingsType::kDefaultApmDesktopAndBeamformer};