[Bug 759860] glfilters: Attach composition overlay when not supported

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759860

--- Comment #7 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
Because the visual result is totally incorrect. Here's two pipeline:

1. overlay ! effect ! sink
2. effect ! overlay ! sink

If you attach the composition in 1. you'll get the result of pipeline 2
(overlay applied after the effect). So when an effect that cannot transform the
meta properly is applied, the overlay should compose right away (in this case
in software).

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