ext/a52dec/gsta52dec.c: Add buffer-frames=0.

ext/a52dec/gsta52dec.c: Add buffer-frames=0.

Original commit message from CVS:
* ext/a52dec/gsta52dec.c: (gst_a52dec_reneg):
Add buffer-frames=0.
* ext/dvdread/dvdreadsrc.c: (dvdreadsrc_get_type),
(dvdreadsrc_init), (dvdreadsrc_get_event_mask),
(dvdreadsrc_get_query_types), (dvdreadsrc_get_formats),
(dvdreadsrc_srcpad_event), (dvdreadsrc_srcpad_query),
(_seek_title), (_seek_chapter), (get_next_cell_for), (_read),
(seek_sector), (dvdreadsrc_get), (dvdreadsrc_open_file),
(dvdreadsrc_change_state), (dvdreadsrc_uri_get_type),
(dvdreadsrc_uri_get_protocols), (dvdreadsrc_uri_get_uri),
(dvdreadsrc_uri_set_uri), (dvdreadsrc_uri_handler_init):
* ext/dvdread/dvdreadsrc.h:
Add seeking, querying for bytes, sectors, title, angle and
chapter. Handle multiple chapters. Relicense to LGPL because
Billy agreed on that (thanks Billy!).