Move pip install after setting up VS environment (#39898)
Summary:
This is needed, because pip might want to build ninja from source
Pull Request resolved: https://github.com/pytorch/pytorch/pull/39898
Differential Revision: D22010548
Pulled By: malfet
fbshipit-source-id: 55423324c381aaec8a3c81f95f9405dd618b4e49
