Issue description:
When using cmake-gui on Ubuntu to build the latest 'master' opencv from git, the Python binding cv2.cpython-36m-x86_64-linux-gnu.so goes to a funky directory: /usr/local/python/cv2/
instead of: /usr/local/lib/python3.6/dist-packages/.
I haven't found where in cmake-gui we can change this?
The only path available is: PYTHON3_PACKAGES_PATH which in my case was set to lib/python3.6/dist-packages relative to /usr/local of course.
So, it should have end up in the correct directory, I don't know why it doesn't.