Correctly apply WIN32_LEAN_AND_MEAN to the whole repo (#49025)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/48895
Pull Request resolved: https://github.com/pytorch/pytorch/pull/49025
Reviewed By: zhangguanheng66
Differential Revision: D25399912
Pulled By: ezyang
fbshipit-source-id: 9b7225b0e43511e0b8981c39035d814a4406c523
