[Bug 726833] ximagesrc: Add alpha channel support

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=726833
  GStreamer | gst-plugins-good | git

--- Comment #1 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2014-03-21 17:14:23 UTC ---
Created an attachment (id=272580)
 View: https://bugzilla.gnome.org/attachment.cgi?id=272580
 Review: https://bugzilla.gnome.org/review?bug=726833&attachment=272580

Add ARGB/BGRA support

This is no intrusive, and fixes a bug where the ximagesrc would push caps with
format=NULL. I propose to also include it in stable.

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