newsegment API update.

newsegment API update.

Original commit message from CVS:
* ext/dv/gstdvdemux.c: (gst_dvdemux_handle_sink_event),
(gst_dvdemux_demux_frame):
* ext/flac/gstflacdec.c: (gst_flacdec_write):
* gst/auparse/gstauparse.c: (gst_auparse_chain):
* gst/avi/gstavidemux.c: (gst_avi_demux_stream_header),
(gst_avi_demux_handle_seek):
* gst/goom/gstgoom.c: (gst_goom_event):
* gst/wavenc/gstwavenc.c: (gst_wavenc_stop_file):
* gst/wavparse/gstwavparse.c: (gst_wavparse_handle_seek),
(gst_wavparse_stream_headers), (gst_wavparse_stream_data),
(gst_wavparse_loop), (gst_wavparse_pad_convert),
(gst_wavparse_srcpad_event):
newsegment API update.