Remove the inclusion of unneeded headers

Originally committed as revision 21152 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/rtp.c

@@ -19,12 +19,8 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#include "libavcodec/get_bits.h"
 #include "avformat.h"
 
-#include <unistd.h>
-#include "network.h"
-
 #include "rtp.h"
 
 //#define DEBUG