Expose VC_YEAR in Windows binary test jobs (#38957)
Summary:
To make it configurable in https://github.com/pytorch/builder/pull/445.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/38957
Differential Revision: D21721933
Pulled By: ezyang
fbshipit-source-id: 510b19e59bed4ff9d6c39173b4d5c5fc69290ed0
