This allows the default value of rc_sys to be set when openrc is
compiled. This will allow openrc to be installed, e.g. on vserver guests
and will allow them to be rebooted without the need to edit rc.conf.
This patch is a combined effort between myself and Robin Johnson.
X-Gentoo-Bug: 357247
X-Gentoo-Bug-URL: http://bugs.gentoo.org/show_bug.cgi?id=357247