Make stub version of ff_sdp_write_media() match its prototype

Used when compiled without CONFIG_RTP_MUXER

Fallout from r24915

Originally committed as revision 24935 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/sdp.c

@@ -511,8 +511,7 @@ int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size)
     return AVERROR(ENOSYS);
 }
 
-void ff_sdp_write_media(char *buff, int size, AVCodecContext *c,
-                        const char *dest_addr, int port, int ttl)
+void ff_sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, const char *dest_type, int port, int ttl)
 {
 }
 #endif