ext/lcs/gstcolorspace.c: Merge Ronald's patch (bug #117897) and update for new caps...

ext/lcs/gstcolorspace.c: Merge Ronald's patch (bug #117897) and update for new caps and negotiation.  Seems to work, ...

Original commit message from CVS:
* ext/lcs/gstcolorspace.c: (colorspace_find_lcs_format),
(gst_colorspace_caps_get_fourcc), (colorspace_setup_converter),
(gst_colorspace_getcaps), (gst_colorspace_link),
(gst_colorspace_base_init), (gst_colorspace_init),
(gst_colorspace_chain), (gst_colorspace_change_state),
(plugin_init): Merge Ronald's patch (bug #117897) and update
for new caps and negotiation.  Seems to work, although it
shows off bugs in lcs.