[Bug 667294] build: Don't run largefile check if necessary defines are already set

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=667294
  GStreamer | gstreamer (core) | git

--- Comment #3 from Idar Tollefsen <itollefs at cisco.com> 2012-05-15 13:39:23 UTC ---
It's not speedup, but possible conflicting defines set in CPPFLAGS (or others).

That said, I agree that it's a corner case and maintainability is indeed more
important. Scratch it.

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