runit: changed behavious to install sysvinit scripts in etc/init.d instead of etc/rc.d/init.d
Revert "runit: changed to not install sysvinit's system script"

This reverts commit e1cb5e45636f7ccc72e1bf739104064fbecbad8b.
It is a hack but atm we don't have a better/cleaner alternative.