The deletion of "cv.py" file (Commit b2ba8b9) breaks "make install"

Drop old python interface commit
https://github.com/Itseez/opencv/commit/b2ba8b9969df8f31a0de432c5a2deb3e17eacbaf#commitcomment-3053530

breaks "make install"

I think that deleting this line it is enough to fix it.