playbin: use avdeinterlace for deinterlacing until deinterlace is ported

gst/playback/gstplaysink.c

@@ -1363,6 +1363,10 @@ gen_video_deinterlace_chain (GstPlaySink * playsink)
 
   GST_DEBUG_OBJECT (playsink, "creating deinterlace");
   chain->deinterlace = gst_element_factory_make ("deinterlace", "deinterlace");
+  if (chain->deinterlace == NULL) {
+    chain->deinterlace =
+        gst_element_factory_make ("avdeinterlace", "deinterlace");
+  }
   if (chain->deinterlace == NULL) {
     post_missing_element_message (playsink, "deinterlace");
     GST_ELEMENT_WARNING (playsink, CORE, MISSING_PLUGIN,