Specifying libtorch variant in libtorch builds (#23348)
Summary:
This should fix all libtorch timeout issues
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23348
Differential Revision: D16472782
Pulled By: pjh5
fbshipit-source-id: b1f3a783d044eb881f6e8755e0c891093e93c93e
