MangoHud nvctrl library

Normally we use the nvml library to get GPU metrics for nvidia GPUs, however older devices pre 900-series somewhere is not supported by the nvml library. In these cases MangoHud has a fallback to use the nvctrl library instead, but this library is not included in the runtime.

I suggest adding this library to the gfx stack to resolve this issue

SONAME: libXNVCtrl.so.0