avformat/rtsp: Support mode field of Transport header being sent in upper case

Fixes server compatibility issues with rtspclientsink GStreamer plugin

Signed-off-by: Paul Orlyk <paul.orlyk@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/rtsp.c

@@ -1012,8 +1012,8 @@ static void rtsp_parse_transport(AVFormatContext *s,
                 if (*p == '=') {
                     p++;
                     get_word_sep(buf, sizeof(buf), ";, ", &p);
-                    if (!strcmp(buf, "record") ||
-                        !strcmp(buf, "receive"))
+                    if (!av_strcasecmp(buf, "record") ||
+                        !av_strcasecmp(buf, "receive"))
                         th->mode_record = 1;
                 }
             }