[Bug 756245] glshader: Add GRAY8 support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=756245

--- Comment #6 from Matthew Waters <ystreet00 at gmail.com> ---
You have to select it somehow with a capsfilter or override the fixate_caps
virtual method in your element to select GRAY8 instead of RGBA.

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