[Bug 760979] tracers: Allow adding tracers programatically without defining environment variables

[GStreamer (GNOME Bugzilla)]

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

--- Comment #13 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Let's get this in then so that the tracer enabled gst-validate can be merged
and tested properly for a long enough time before 1.8.0?

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