CMake incorrectly links to nvrtc-builtins

[peastman (Peter Eastman)]

I think I’ve found a way to work around the problem:

FIND_LIBRARY(NVRTC_LIB nvrtc PATHS "${CUDAToolkit_LIBRARY_DIR}")

and then I link to ${NVRTC_LIB} instead of CUDA::nvrtc. I still need to test a bit more, but so far it seems to be working.