Missing prototype added

Originally committed as revision 7760 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/rtp.h

@@ -41,6 +41,7 @@ extern AVInputFormat rtp_demuxer;
 int rtp_get_local_port(URLContext *h);
 int rtp_set_remote_url(URLContext *h, const char *uri);
 void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd);
+int rtp_check_and_send_back_rr(RTPDemuxContext *s, int count);
 
 extern URLProtocol rtp_protocol;