[Bug 648001] configure: Fix linsys/decklink checks for Linux

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=648001
  GStreamer | gst-plugins-bad | unspecified

--- Comment #2 from Sebastian Dröge <slomo at circular-chaos.org> 2011-04-17 10:04:12 UTC ---
But the plugins seem to require other headers that are not checked here, e.g.
sdivideo.h

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