Merge topic 'cuda_clang_toolkit_path' into release-3.18

ec59fb6c31 CUDA: Determine CUDA toolkit location for NVCC
0a056246a1 CUDA: Pass toolkit path to Clang
9c43972127 FindCUDAToolkit: Avoid unnecessary temporary variable computing binary dir
9eebb5b8b2 FindCUDAToolkit: Remove unnecessary checks around searches
8f01fe7bf1 FindCUDAToolkit: Use list(SORT) to sort in natural order
8c144fe9ad FindCUDAToolkit: Compute CUDAToolkit_INCLUDE_DIR instead of searching
403f8d31e3 FindCUDAToolkit: Add CUDAToolkit_LIBRARY_ROOT
6636693134 FindCUDAToolkit: Re-unify with Internal/CUDAToolkit

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !4828