Fix build issue. CUDA may be installed in `$CUDA_HOME/lib` on macOS. (#23491)
Summary:
Closes gh-16955.
Closes https://github.com/pytorch/vision/issues/977
On Linux both `lib64` and `lib` may be present (symlinked). The reports
seem to all be about macOS, but it seems like this is also possibly more
robust on Linux and can't hurt. So not treating platforms differently.
Note that Eigen has a similar check in its CMake:
```
if(CUDA_64_BIT_DEVICE_CODE AND (EXISTS "${CUDA_TOOLKIT_ROOT_DIR}/lib64"))
link_directories("${CUDA_TOOLKIT_ROOT_DIR}/lib64")
else()
link_directories("${CUDA_TOOLKIT_ROOT_DIR}/lib")
endif()
```
There may be other issues for building from source on macOS, can't test.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23491
Differential Revision: D16538973
Pulled By: soumith
fbshipit-source-id: cc309347b7d16e718e06878d3824d0a6e40b1019
