Added build flag around the Intelligibility enhancer performance test code

webrtc/webrtc_tests.gypi

 # Copyright (c) 2013 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.
 {
   'targets': [
     {
@@ skipping 438 matching lines @@
         'video_quality_test',
         'modules/modules.gyp:neteq_test_support',
         'modules/modules.gyp:bwe_simulator',
         'modules/modules.gyp:rtp_rtcp',
         'test/test.gyp:test_common',
         'test/test.gyp:test_main',
         'test/test.gyp:test_renderer',
         'webrtc',
       ],
       'conditions': [
+        ['enable_intelligibility_enhancer==1', {
+         'defines': ['WEBRTC_INTELLIGIBILITY_ENHANCER=1',],
+        }, {
+         'defines': ['WEBRTC_INTELLIGIBILITY_ENHANCER=0',],
+        }],
+
         ['OS=="android"', {
           'dependencies': [
             '<(DEPTH)/testing/android/native_test.gyp:native_test_native_code',
           ],
         }],
       ],
     },
     {
       'target_name': 'webrtc_nonparallel_tests',
       'type': '<(gtest_target_type)',
@@ skipping 183 matching lines @@
             'build/isolate.gypi',
           ],
           'sources': [
             'webrtc_perf_tests.isolate',
           ],
         },
       ],
     }],
   ],
 }