[Bug 751073] Bump gtk+3 to 3.16

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=751073

--- Comment #3 from Xavier Claessens <xclaesse at gmail.com> ---
Created attachment 305429
  --> https://bugzilla.gnome.org/attachment.cgi?id=305429&action=edit
Bump atk to 2.16 and gtk+3 to 3.16

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