[Bug 745213] Shorten __FILE__ in gst_debug_log output on all platforms.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745213

--- Comment #4 from Edward Hervey <bilboed at bilboed.com> ---
Fair enough, but in that case let's just enabled it when we *know* __FILE__
will return an absolute path.

Solutions:
1) detect it at configure time (is there already a m4 macro for that ?)
2) detect at runtime (with a global atomic which is checked the very first
time)

I'd prefer solution 1 (zero cost at runtime), but 2 is acceptable also

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