Updates for API changes

Updates for API changes

Original commit message from CVS:
* ext/libvisual/visual.c: (gst_visual_src_setcaps), (get_buffer),
(gst_visual_chain):
* ext/theora/theoraenc.c: (theora_enc_sink_setcaps):
* gst/videorate/gstvideorate.c: (gst_videorate_setcaps),
(gst_videorate_chain):
* gst/videotestsrc/gstvideotestsrc.c:
(gst_videotestsrc_src_fixate), (gst_videotestsrc_create):
* sys/v4l/gstv4lmjpegsrc.c: (gst_v4lmjpegsrc_get_fps),
(gst_v4lmjpegsrc_src_convert), (gst_v4lmjpegsrc_src_query),
(gst_v4lmjpegsrc_get), (gst_v4lmjpegsrc_getcaps):
* sys/v4l/v4lsrc_calls.c: (gst_v4lsrc_get_fps),
(gst_v4lsrc_get_fps_list), (gst_v4lsrc_buffer_new):
Updates for API changes