Suppress ?params in the rtsp uri

Right now rtsp demuxer receives it's ffmpeg specific params encoded in the url
That made the server receiving requests with the url ending with "?udp",
"?multicast" and "?tcp". That may or may not cause problems to servers with
overly strict or overly simple uri parsers

Patch from Armand Bendanan (name.surnameATfreeDOTfr)

Originally committed as revision 20363 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/rtsp.c

@@ -1215,6 +1215,11 @@ static int rtsp_read_header(AVFormatContext *s,
             else if (strcmp(option, "tcp") == 0)
                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
         }
+        // Suppress the options in the filename
+        if (option_list = strchr(s->filename, '?')) {
+            *option_list = 0;
+            dprintf(NULL, "### rtsp_read_header: suppr options:%s\n", s->filename);
+        }
     }
 
     if (!lower_transport_mask)