opencv conda-forge recipe + BSD3 license

conda/opencv/0001-Fix-for-building-with-old-V4L.patch

...make-download-tries-customizable-download-parameter.patch

conda/opencv/CMakeLists.txt

conda/opencv/LICENSE.txt

conda/opencv/bld.bat

conda/opencv/build.sh

conda/opencv/color_palette_alpha.png

conda/opencv/meta.yaml

conda/opencv/run_py_test.py

conda/opencv/test.cpp

conda/opencv/test_1_c1.jpg

conda/opencv/yum_requirements.txt