[Cin] Limit number of opencv modules we build

[Andrew Randrianasulu]

Hopefully I get them right! Builds with opencv4 (2020 tarball) on Slackware
-current x86_64

hopefully will make compile farm's job a bit easier.

Note, I only modded and tested local static build, you can try to add
similar line (with closing "\" !) to second, dynamic case in opencv_build
file in root of cingg source tree.
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