[Bug 749421] validate: Use gtk >= 3.10 for gtk plugins

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=749421

--- Comment #3 from Thibault Saunier <tsaunier at gnome.org> ---
Thanks for the report.

Using that method is clearly not mandatory for us so could you please check
that fix is enough please? :)

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