pytorch

78e1f9db - port //c10/macros to common build structure (#70852)

port //c10/macros to common build structure (#70852) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/70852 This is the first change that uses a common build file, build.bzl, to hold most of the build logic. ghstack-source-id: 147170895 Test Plan: Relying on internal and external CI. Reviewed By: malfet Differential Revision: D33299331 fbshipit-source-id: a66afffba6deec76b758dfb39bdf61d747b5bd99 (cherry picked from commit d9163c56f55cfc97c20f5a6d505474d5b8839201)