rtspconnection: don't use GLib-2.16 API, we require only 2.14

Fixes #579267.

gst-libs/gst/rtsp/gstrtspconnection.c

@@ -2808,9 +2808,12 @@ static void
 gst_rtsp_source_finalize (GSource * source)
 {
   GstRTSPWatch *watch = (GstRTSPWatch *) source;
+  gpointer rtsp_rec;
 
   build_reset (&watch->builder);
 
+  while ((rtsp_rec = g_async_queue_try_pop (watch->messages)))
+    gst_rtsp_rec_free (rtsp_rec);
   g_async_queue_unref (watch->messages);
   watch->messages = NULL;
 
@@ -2862,7 +2865,8 @@ gst_rtsp_watch_new (GstRTSPConnection * conn,
   result->conn = conn;
   result->builder.state = STATE_START;
 
-  result->messages = g_async_queue_new_full (gst_rtsp_rec_free);
+  /* FIXME: use g_async_queue_new_full() once we depend on GLib >= 2.16 */
+  result->messages = g_async_queue_new ();
 
   result->readfd.fd = -1;
   result->writefd.fd = -1;