[Bug 767268] Add missing filename type annotations

[GStreamer (GNOME Bugzilla)]

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

--- Comment #4 from Christoph Reiter (lazka) <reiter.christoph at gmail.com> ---
My goal is to make "sys.argv = Gst.init(sys.arv)" not crash with Python 3 if
argv contains non-utf8 data.

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