Disable warnings failing when using Clang on Windows

webrtc/modules/audio_coding/codecs/isac/isac_test.gypi

 # 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.
 
 {
   'targets': [
     # simple kenny
     {
       'target_name': 'isac_test',
       'type': 'executable',
       'dependencies': [
         'isac',
       ],
       'include_dirs': [
         './main/test',
         './main/include',
         './main/util',
         '<(webrtc_root)',
       ],
       'sources': [
         './main/test/simpleKenny.c',
         './main/util/utility.c',
       ],
+      'conditions': [
+        ['OS=="win" and clang==1', {
+          'msvs_settings': {
+            'VCCLCompilerTool': {
+              'AdditionalOptions': [
+                # Disable warnings failing when compiling with Clang on Windows.
+                # https://bugs.chromium.org/p/webrtc/issues/detail?id=5366
+                '-Wno-format',
+              ],
+            },
+          },
+        }],
+      ],  # conditions.
     },
     # ReleaseTest-API
     {
       'target_name': 'isac_api_test',
       'type': 'executable',
       'dependencies': [
         'isac',
       ],
       'include_dirs': [
         './main/test',
@@ skipping 18 matching lines @@
         './main/include',
         '../../../../common_audio/signal_processing/include',
         './main/util',
         '<(webrtc_root)',
       ],
       'sources': [
         './main/test/SwitchingSampRate/SwitchingSampRate.cc',
         './main/util/utility.c',
       ],
     },
-
   ],
 }