Revert "Remove detection of mmsh protocol in ffplay."

This reverts commit 2f642393.

ffplay.c

@@ -2543,8 +2543,10 @@ static int read_thread(void *arg)
             else
                 av_read_play(ic);
         }
-#if CONFIG_RTSP_DEMUXER
-        if (is->paused && !strcmp(ic->iformat->name, "rtsp")) {
+#if CONFIG_RTSP_DEMUXER || CONFIG_MMSH_PROTOCOL
+        if (is->paused &&
+                (!strcmp(ic->iformat->name, "rtsp") ||
+                 (ic->pb && !strcmp(url_fileno(ic->pb)->prot->name, "mmsh")))) {
             /* wait 10 ms to avoid trying to get another packet */
             /* XXX: horrible */
             SDL_Delay(10);