VS: Add support for custom CUDA toolkit location

Benjamin Wozniakrequested to merge
B.Wozniak/cmake:#18864_custom_cuda_toolkit_location into master

Extend the cuda= field of CMAKE_GENERATOR_TOOLSET to support a path to a custom CUDA toolkit directory, e.g. cuda=C:\path\to\cuda.

Fixes: #18864 (closed)
Topic-rename: vs-cuda-custom-dir

Edited by Brad King

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