[Bug 767268] Add missing filename type annotations

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767268

--- Comment #7 from Christoph Reiter (lazka) <reiter.christoph at gmail.com> ---
I've just send a message to gir-devel-list to get some advice:
https://mail.gnome.org/archives/gir-devel-list/2016-June/msg00000.html

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