Ubuntu 20.04 + AMD ROCm 3.9
Fresh install Ubuntu 20.04 + AMD ROCm 3.9.

driver is running, opencl detects gpus:
```
$ clinfo |grep Board
  Board name:					 Vega 10 XTX [Radeon Vega Frontier Edition]
  Board name:					 Vega 10 XL/XT [Radeon RX Vega 56/64]
  Board name:					 Vega 10 XL/XT [Radeon RX Vega 56/64]
```

nanominer does not detect gpus:
```
$ ./nanominer -d
Detected 0 devices.
```

Any ideas?