Raise error in CMake for CUDA <9.2 (#61462)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/61462
Anything before CUDA 9.2 is not supported (see https://github.com/pytorch/pytorch/pull/36848), and perhaps not even that.
ghstack-source-id: 133312018
Test Plan: CI
Reviewed By: samestep
Differential Revision: D29637251
fbshipit-source-id: 4300169b7298274b2074649342902a34bd2220b5
