Remove some duplicate object dependencies for the RTSP demuxer.

They are already covered by its dependency on the SDP demuxer.

Originally committed as revision 20324 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/Makefile

@@ -204,10 +204,7 @@ OBJS-$(CONFIG_RTP_MUXER)                 += rtp.o         \
                                             rtpenc.o      \
                                             rtpenc_h264.o \
                                             avc.o
-OBJS-$(CONFIG_RTSP_DEMUXER)              += rtsp.o        \
-                                            rdt.o         \
-                                            rtp_asf.o     \
-                                            rtp_vorbis.o
+OBJS-$(CONFIG_RTSP_DEMUXER)              += rtsp.o
 OBJS-$(CONFIG_SDP_DEMUXER)               += rtsp.o        \
                                             rdt.o         \
                                             rtp.o         \