Drop rc_sys definition from build system

README

@@ -12,7 +12,6 @@ LIBNAME=lib64
 DESTDIR=/tmp/openrc-image
 MKPAM=pam
 MKPKGCONFIG=no
-MKRCSYS=prefix
 MKSELINUX=yes
 MKSTATICLIBS=no
 MKTERMCAP=ncurses
@@ -34,20 +33,6 @@ LOCAL_PREFIX should be set when to where user maintained packages are.
 Only set LOCAL_PREFIX if different from PKG_PREFIX.
 PREFIX should be set when OpenRC is not installed to /.
 
-MKRCSYS should be set only if you need to specify a default system
-subtype. The subtype should be set to match the type of environment the
-file is installed into, not the virtualization the environment is
-capable of handling. Here is a list of subtypes and their meanings.
-
-jail	FreeBSD jail
-lxc	Linux container
-openvz	Linux OpenVZ
-prefix	Linux and *BSD prefix system
-uml	UsermodeLinux
-vserver	Linux vserver
-xen0 Linux and NetBSD xen0 Domain
-xenU Linux and NetBSD xenU Domain
-
 If any of the following files exist then we do not overwrite them
 /etc/devd.conf
 /etc/rc