[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

Sebastian Dröge <slomo> changed:

           What    |Removed                     |Added
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   Target Milestone|HEAD                        |0.10.22
           Severity|normal                      |blocker

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