Make sure we don't add '-cuda' to the link line with NVC++ when CUDA is not enabled #5485
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Fix #5483
Obviously, in an ideal world we don't process that entire block when the CUDA backend is not enabled. Wrapping it in a big
if(KOKKOS_ENABLE_CUDA)
makes the code less readable and I don't want to get into refactoring the whole thing. I considered introducing aKOKKOS_CUDA_LINK_OPTIONS
variables but that would force us to duplicate some target_link_options workaround for CMake version less than 3.18