[Bug 760979] gst: Fix some initialization/deinit issues

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=760979

--- Comment #11 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
The change makes sense to me at least. It allows to enable and add tracers
independent of the environment variables via API. Just like we allow with the
debugging system.

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