CUDA_NVCC_EXECUTABLE is not needed, as nvcc is in PATH (#18958)
Summary:
As indicated by f0k: https://github.com/pytorch/pytorch/pull/18495#issuecomment-480178763
nvcc via ccache is already first in the PATH in the instructions I provided, so CUDA_NVCC_EXECUTABLE is not needed.
I re-built to test that it's so.
Thank you!
Pull Request resolved: https://github.com/pytorch/pytorch/pull/18958
Differential Revision: D14810732
Pulled By: ezyang
fbshipit-source-id: 3758ae2253c745c5d7cfccedd49fa00cc4629965
