[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 #3 from Philippe Renon <philippe_renon at yahoo.fr> ---
Created attachment 340626
  --> https://bugzilla.gnome.org/attachment.cgi?id=340626&action=edit
opencv: check presence of required opencv_contrib headers

The patch simply checks that one of the needed opencv_header is present.

This header is needed by the segmentation element of the opencv plugin.

Ideally we should have a HAVE_OPENCV_CONTRIB flag and conditionally build the
element that depend on it.

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