VS: CUDA_ARCHITECTURES generates wrong flags for real architectures

Setting CUDA_ARCHITECTURES results in wrong flags when specifying real architectures (e.g. 86-real) if using a Visual Studio generator. The generated flags are correct using other generators like Ninja, including on Linux, using the same version of CMake.

CMake: 3.23.1

Generator: Visual Studio 17 2022

CUDA: 11.6.2

For example:

86-real results in -gencode=arch=compute_86,code=\"sm_86,compute_86\", which generates code for both real (sm_86) and virtual (compute_86) architectures but it should generate only for the real one. The correct flag would be -gencode arch=compute_86,code=sm_86

The following cases work correctly but the generated flags are quite odd and redundant:

86-virtual results in -gencode=arch=compute_86,code=\"compute_86,compute_86\", which is correct but it could be simply -gencode arch=compute_86,code=compute_86

86 results in -gencode=arch=compute_86,code=\"compute_86,compute_86\" -gencode=arch=compute_86,code=\"sm_86,compute_86\", which is also correct but could be replaced with a single flag: -gencode arch=compute_86,code=[sm_86,compute_86]. Using Ninja this more compact flag is generated.