[Bug 709423] v4l2bufferpool: O_CLOEXEC needs _GNU_SOURCE

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=709423
  GStreamer | gst-plugins-good | 1.2.0

--- Comment #2 from Peter Korsgaard <jacmet at sunsite.dk> 2013-10-04 12:22:28 UTC ---
(In reply to comment #1)
> (From update of attachment 256463 [details])
> You should only #define it if it wasn't defined yet, otherwise it might lead to
> compiler warnings

We define it before including any headers (except for config.h), so that's
fairly unlikely but ok, I'll attach an updated patch

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