pkgconfig/: Add gst/tag to the -L list.

pkgconfig/: Add gst/tag to the -L list.

Original commit message from CVS:
2005-06-02  Andy Wingo  <wingo@pobox.com>

* pkgconfig/gstreamer-libs-uninstalled.pc.in (prefix):
* pkgconfig/gstreamer-libs.pc.in (prefix): Add gst/tag to the -L
list.

* gst/playback/gstdecodebin.c (gst_decode_bin_dispose): Don't
remove the typefind, the bin dispose will do it for us. When it's
removed and unreffed, the signal handler will be disconnected,
too.
(unlinked): It's too difficult to disconnect from unlinked
handlers, as they are on pads not elements. Just punt if the pads
aren't grandkids of the bin.