AMD 6600XT on Linux - no device detected
Hi, I'm running LInux on kernel 5.13.9-100.fc33.x86_64 (fedora), and nanominer doesn't seem to detect my GPU.

Note I'm not running any proprietary drivers.

```bash
[20:34:25] [/run/media/linuxdata21/crypto/eth/nanominer-linux-3.3.8]
-> % ./nanominer -d
Detected 0 devices.
```