cuBLAS on WSL: "no CUDA-capable device is detected"

Hi there,

I'm following this instruction to build llama.cpp from scratch:
https://github.com/ggerganov/llama.cpp#cublas
I run it in ubuntu in WSL.
CPU inference works for me with no issue, but when I try to run cublas build it fails with:

```
CUDA error 100 at /mnt/c/ws/ai/llama/llama.cpp/ggml-cuda.cu:485: no CUDA-capable device is detected
current device: 0
GGML_ASSERT: /mnt/c/ws/ai/llama/llama.cpp/ggml-cuda.cu:485: !"CUDA error"
Aborted
```

Any idea how can I fix it?

Thanks,
Mike.