Fix dll load failure in virtual environments on Windows (#39622)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/39620.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/39622
Differential Revision: D21953420
Pulled By: malfet
fbshipit-source-id: ab0e0358327ec321130384e0a654987cd70349c0
