ports tree (that doesn't meant that those problems come from lands other
than OpenCV itself):
1. Stop exporting opencv_java target: noone links to the libopencv_java.so,
anyway, and it breaks find_package(OpenCV) when opencv-java is absent.
The actual broken port was Digikam on i386 (yes, due to some funny
reasons, this didn't trigger on amd64).
2. Switch to gstreamer1 since OpenCV picks it up nowadays, if the former
is found. WANTLIB updates included.
Initial report and testing by sthen@.
Okays:
(1) by dcoppa@, sthen@ (implicit) and Rafael Sadowski (MAINTAINER).
(2) by sthen@ (implicit).
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