FindCUDA: Update to properly find MSVC 2017 compiler tools
MSVC 2017 changed the location of its tools, per https://blogs.msdn.microsoft.com/vcblog/2016/10/07/compiler-tools-layout-in-visual-studio-15/
Edited by Brad King
MSVC 2017 changed the location of its tools, per https://blogs.msdn.microsoft.com/vcblog/2016/10/07/compiler-tools-layout-in-visual-studio-15/