pytorch

7139410b - Allow USE_NINJA to be toggled by an env variable

Allow USE_NINJA to be toggled by an env variable Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/16665 Differential Revision: D13930021 Pulled By: pjh5 fbshipit-source-id: 4b490f952a56e8561329ab8898be2bf779b46b9d