Building with cmake doesn't set CUDA_ARCHITECTURES correctly

… at least on my Windows machine.

Setting GPU_TARGET to any value doesn’t work because it ends up setting the variable CUDA_ARCHITECTURES which is not used anywhere. Therefore, the default value of CMAKE_CUDA_ARCHTECTURES remains 52 and nvcc compiles for sm52 only no matter what.

Fix is simple:

replace set(CUDA_ARCHITECTURES "${__cuda_architectures}")

to set(CMAKE_CUDA_ARCHITECTURES "${__cuda_architectures}" CACHE STRING "CUDA architectures" FORCE)

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