[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 #6 from Tim-Philipp Müller <t.i.m at zen.co.uk> 2014-03-27 20:09:45 UTC ---
It works without this patch as well, but that seems to rely on implementation
details of the format_from_masks function.

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