'undefined: getUptime' error when building in Mac

Hi
I get this error when building in Mac
```
./scripts/build.sh
# github.com/liamg/darktile/internal/app/darktile/hinters
internal/app/darktile/hinters/hint_dmesg_timestamp.go:54:54: undefined: getUptime
make: *** [build] Error 1
```
It is MacOS Ventura 13.1

Thanks
Jasmeer