rtpdec: Remove an outdated todo comment

This comment was added in e309128f, in 2002, and has been brought
along since then more or less unmodified.

The first point of the todo was implemented in dbf30963 in 2006,
the second one is not relevant to rtpdec.c (brought along from
rtp.c in 8eb793c4 in 2008) but would be more relevant to the
rtp muxer, although it isn't a good idea anyway.
Signed-off-by: Martin Storsjö <martin@martin.st>

libavformat/rtpdec.c

@@ -30,16 +30,6 @@
 #include "rtpdec.h"
 #include "rtpdec_formats.h"
 
-/* TODO:
- * - add RTCP statistics reporting (should be optional).
- *
- * - add support for H.263/MPEG-4 packetized output: IDEA: send a
- * buffer to 'rtp_write_packet' contains all the packets for ONE
- * frame. Each packet should have a four byte header containing
- * the length in big-endian format (same trick as
- * 'ffio_open_dyn_packet_buf').
- */
-
 static RTPDynamicProtocolHandler realmedia_mp3_dynamic_handler = {
     .enc_name   = "X-MP3-draft-00",
     .codec_type = AVMEDIA_TYPE_AUDIO,