GPU: H100 , CUDA: 12.2 - issues getting arch recognized in build scripts.

This project hasn't been updated in a while, but in case the maintainer is still around:

Getting a failure with:

```
 UnboundLocalError: local variable 'arch' referenced before assignment
 ```

likely because the `cuda_setup.py` is quite a bit stale at this point with selection. Any guidance on extending it or even if it is going to work?