unset amd_flags so that backward compat (amd=YES) works

src/etc/rc.conf

@@ -1,6 +1,6 @@
 #!/bin/sh -
 #
-#	$OpenBSD: rc.conf,v 1.155 2011/07/11 02:49:50 deraadt Exp $
+#	$OpenBSD: rc.conf,v 1.156 2011/07/11 05:50:05 robert Exp $
 
 # set these to "NO" to turn them off.  otherwise, they're used as flags
 ldpd_flags=NO		# for normal use: ""
@@ -118,7 +118,7 @@ local_rcconf="/etc/rc.conf.local"
 
 unset inetd_flags rwhod_flags portmap_flags kdc_flags kadmind_flags
 unset kpasswdd_flags btd_flags nfsd_flags mountd_flags lockd_flags
-unset statd_flags
+unset statd_flags amd_flags
 
 [ -f ${local_rcconf} ] && . ${local_rcconf} # Do not edit this line