[Bug 772822] opencv: reinstate check for opencv contrib, compilation fails without it

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772822

--- Comment #9 from Philippe Renon <philippe_renon at yahoo.fr> ---
Note that if opencv_contrib is not detected then neither ext/opencv nor the new
gst-libs/gst/opencv will be built.

gst-libs/gst/opencv does not depend on opencv_contrib so could be built even if
opencv_contrib is missing.

Only one ext/opencv element (afaik) relies on opencv_contrib. Ideally the other
ones should be build if opencv_contrib is missing.

We could introduce a HAVE_OPENCV_CONTRIB and have HAVE_OPENCV be true if plain
opencv is found.

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