applemedia/avsample: fix unconditional use of OSX 10.10 API

We can just not use the error/status properties

https://bugzilla.gnome.org/show_bug.cgi?id=746631

sys/applemedia/avsamplevideosink.m

@@ -748,11 +748,13 @@ gst_av_sample_video_sink_show_frame (GstVideoSink * vsink, GstBuffer * buf)
     _request_data (av_sink);
   g_mutex_unlock (&av_sink->render_lock);
 
+#if defined(MAC_OS_X_VERSION_MAX_ALLOWED) && MAC_OS_X_VERSION_MAX_ALLOWED >= 1010
   if ([av_sink->layer status] == AVQueuedSampleBufferRenderingStatusFailed) {
     GST_ERROR_OBJECT (av_sink, "failed to enqueue buffer on layer, %s",
         [[[av_sink->layer error] description] UTF8String]);
     return GST_FLOW_ERROR;
   }
+#endif
 
   return ret;
 }