FindCUDA: Update to work with clcache.exe

Edward Z. Yangrequested to merge
ezyang/cmake:pr/nvcc-clcache-support into master

If you try to use nvcc with clcache.exe, it will barf, saying that clcache.exe is not supported. This is not a good outcome. Use cl.exe as the host compiler in this case!

Topic-rename: FindCUDA-nvcc-clcache-support

Edited by Brad King

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