Remove unnecessary rtsp.h #include.

Nothing from the header was used and it caused trouble on Windows CE.

Originally committed as revision 19430 to svn://svn.ffmpeg.org/ffmpeg/trunk

ffplay.c

@@ -23,7 +23,6 @@
 #include <limits.h>
 #include "libavutil/avstring.h"
 #include "libavformat/avformat.h"
-#include "libavformat/rtsp.h"
 #include "libavdevice/avdevice.h"
 #include "libswscale/swscale.h"
 #include "libavcodec/audioconvert.h"