Fix crash while building opencv for OSX#110

Merged

skvark merged 2 commits intoopencv:masterfrom

Jul 20, 2018

Commits on Jul 19, 2018

Add flag to setup.py call so skbuild doesn't default to osx 10.6
yonip
committed
De-pollute parameters to bdist so its only on osx and make sure that osx also sets the correct numpy version for python3.7
yonip
committed