Fix the path where the "runlilo" file gets placed.

Was using $BOOTDIR which is different in the frisbee MFS than anywhere else.

tmcd/freebsd/slicefix

 #!/bin/sh
 #
 # EMULAB-COPYRIGHT
-# Copyright (c) 2000-2004 University of Utah and the Flux Group.
+# Copyright (c) 2000-2005 University of Utah and the Flux Group.
 # All rights reserved.
 #
 
@@ -106,7 +106,11 @@ dolinux() {
 		umount $rootdev
 		return 1
 	}
-	cp /dev/null /mnt/$BOOTDIR/runlilo
+
+	# XXX note the hardwired path, cannot use BOOTDIR as it is different
+        # in frisbee MFS.  This also assumes Linux partition is one big
+	# filesystem.
+	cp /dev/null /mnt/var/emulab/boot/runlilo
 
 	umount $rootdev