[Bug 772555] debug: Implement gst_debug_print_stack_trace with libunwind/backtrace when avalaible

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772555

--- Comment #24 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
I'm ok with removing it, it's just removing functionality on some platforms.
Unlike the commit message says there is no full replacement :)

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