New review comment by dmarto on void-packages repository

https://github.com/void-linux/void-packages/pull/38902#discussion_r955269877

Comment:
from the documentation 
```
--without-systemd 
   Disable the automatic installation of systemd unit files. 
   Normally unit files are installed if the install path can be detected.
```

It only installs services, BUT
even if removed, it won't install any extra files or services - thus adding the flag to make it explicit.

(As can be seen by the current in repo pkg (without flag), there aren't any systemd unit files installed)