New issue by goleo108 on void-packages repository

https://github.com/void-linux/void-packages/issues/23640

Description:
/etc/sv/agetty-generic/run as in arch linux's systemd doesn't work:
```
#!/bin/sh

tty=${PWD##*-}

[ -r conf ] && . ./conf

if [ -x /sbin/getty -o -x /bin/getty ]; then
	# busybox
	GETTY=getty
elif [ -x /sbin/agetty -o -x /bin/agetty ]; then
	# util-linux
	GETTY=agetty
fi

exec setsid ${GETTY}  -o '-p -- \u' ${GETTY_ARGS} \
	"${tty}" "${BAUD_RATE}" "${TERM_NAME}"
```

/etc/rc.local doesn't help either:
```
. /etc/profile
```

/etc/rc.conf is useless too:
```
. /etc/profile
```

slim doesn't prune those variables from /etc/rc.local or /etc/rc.conf because it's started at the correct phase of the moon