Bug 1073003 - Disable -Wattribute warnings in media/webrtc/signaling. r=jesup

--HG--
extra : rebase_source : 94f3143aa82f6dee9042101b2aa7ca123418490a
extra : source : 63c0c77d853e1aa286fb084ba7bd814ee894c42b

media/webrtc/signaling/signaling.gyp

@@ -259,6 +259,13 @@
           'cflags_mozilla': [
           ],
         }],
+        ['OS=="android" or moz_widget_toolkit_gonk==1', {
+          'cflags_mozilla': [
+            # This warning complains about important MOZ_EXPORT attributes
+            # on forward declarations for Android API types.
+            '-Wno-error=attributes',
+          ],
+        }],
         ['OS=="win"', {
           'include_dirs': [
           ],