FreeBSD-specific: readlink doesn't recurse, use realpath.

--- lib/vserver.in.orig	Fri Feb 23 13:04:04 2007
+++ lib/vserver.in	Wed Dec  5 00:21:02 2007
@@ -35,7 +35,7 @@
    getconf VSERVER /usr/sbin/vserver
    getconf VROOTDIR `if [ -x "$VSERVERINFO" ]; then $VSERVERINFO info SYSINFO | grep '^ *vserver-Rootdir' | @AWK@ '{print $2}'; fi`
    # canonicalize VROOTDIR
-   [ -z "$VROOTDIR" ] || VROOTDIR=`readlink --canonicalize $VROOTDIR`
+   [ -z "$VROOTDIR" ] || VROOTDIR=`realpath $VROOTDIR`
    # init this library's global variables
    vservers_are_available=no
    found_vservers=