ext/pango/gsttextoverlay.*: Fix seeking both for muxed formats and subtitles files.

ext/pango/gsttextoverlay.*: Fix seeking both for muxed formats and subtitles files.

Original commit message from CVS:
2006-02-19  Julien MOUTTE  <julien@moutte.net>

* ext/pango/gsttextoverlay.c: (gst_text_overlay_base_init),
(gst_text_overlay_finalize), (gst_text_overlay_init),
(gst_text_overlay_setcaps), (gst_text_overlay_src_event),
(gst_text_overlay_render_text),
(gst_text_overlay_text_pad_link),
(gst_text_overlay_text_event), (gst_text_overlay_video_event),
(gst_text_overlay_pop_text), (gst_text_overlay_text_chain),
(gst_text_overlay_video_chain), (gst_text_overlay_change_state):
* ext/pango/gsttextoverlay.h: Fix seeking both for muxed formats
and subtitles files.