Disable -Wunsequenced warning in audio_coding_module

BUG=1647
TEST=Compile locally on Linux with clang enabled.
TBR=andrew@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1316005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3848 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/audio_coding/main/source/audio_coding_module.gypi

@@ -106,6 +106,18 @@
         'audio_coding_module_impl.cc',
         'audio_coding_module_impl.h',
       ],
+      'conditions': [
+        ['clang==1', {
+          'cflags': [
+            '-Wno-unsequenced',
+          ],
+          'xcode_settings': {
+            'WARNING_CFLAGS': [
+              '-Wno-unsequenced',
+            ],
+          },
+        }],
+      ],
     },
   ],
   'conditions': [