Fix for collect pads API change. Also fix textoverlay state change function.

Fix for collect pads API change. Also fix textoverlay state change function.

Original commit message from CVS:
* ext/cairo/gsttextoverlay.c: (gst_text_overlay_finalize),
(gst_text_overlay_init), (gst_text_overlay_text_pad_linked),
(gst_text_overlay_text_pad_unlinked), (gst_text_overlay_pop_video),
(gst_text_overlay_pop_text), (gst_text_overlay_collected),
(gst_text_overlay_change_state):
* gst/matroska/matroska-mux.c: (gst_matroska_mux_init),
(gst_matroska_mux_reset), (gst_matroska_mux_request_new_pad),
(gst_matroska_mux_best_pad), (gst_matroska_mux_change_state):
* gst/smpte/gstsmpte.c: (gst_smpte_init), (gst_smpte_collected):
* gst/videomixer/videomixer.c: (gst_videomixer_init),
(gst_videomixer_request_new_pad), (gst_videomixer_fill_queues),
(gst_videomixer_change_state):
Fix for collect pads API change. Also fix textoverlay state
change function.