Update `luarocks-build-unix.sh`
Update `luarocks-build-unix.sh`

- Redirect `which` output to `/dev/null`
- Add double quotes
- Use `"$@"` to pass all args to `build`/`install`

0xd4d/iced,0xd4d/iced,0xd4d/iced,0xd4d/iced,0xd4d/iced