Relax opencv
Relax opencv

Upstream uses python-opencv which is a wrapper around opencv which is provided by conda-forge already.

conda-forge/staged-recipes,ocefpaf/staged-recipes,goanpeca/staged-recipes,johanneskoester/staged-recipes,ocefpaf/staged-recipes,conda-forge/staged-recipes,jakirkham/staged-recipes,goanpeca/staged-recipes,jakirkham/staged-recipes,johanneskoester/staged-recipes