Bug 878363 - Disable -Wreserved-user-defined-literal for problematic gstreamer header. r=ted

content/media/gstreamer/GStreamerReader.h

@@ -8,7 +8,10 @@
 #include <gst/gst.h>
 #include <gst/app/gstappsrc.h>
 #include <gst/app/gstappsink.h>
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wreserved-user-defined-literal"
 #include <gst/video/video.h>
+#pragma GCC diagnostic pop
 #include <map>
 #include "MediaDecoderReader.h"