gst/rtp/gstrtpL16pay.c: Removed some unused code.

gst/rtp/gstrtpL16pay.c: Removed some unused code.

Original commit message from CVS:
* gst/rtp/gstrtpL16pay.c: (gst_rtp_L16_pay_handle_buffer):
Removed some unused code.
* gst/rtp/gstrtpamrpay.c: (gst_rtp_amr_pay_handle_buffer):
* gst/rtp/gstrtpgsmpay.c: (gst_rtp_gsm_pay_handle_buffer):
* gst/rtp/gstrtpmp2tpay.c: (gst_rtp_mp2t_pay_handle_buffer):
* gst/rtp/gstrtpspeexpay.c: (gst_rtp_speex_pay_handle_buffer):
* gst/rtp/gstrtptheorapay.c: (gst_rtp_theora_pay_init_packet),
(gst_rtp_theora_pay_flush_packet):
* gst/rtp/gstrtpvorbispay.c: (gst_rtp_vorbis_pay_flush_packet):
Try to preserve the incomming buffer duration on the outgoing
packets. Fixes #478244.