Remove another instance of All Rights Reserved.

Remove the phrase from boilerplate copyright we stick on vers.c when
we can't find the template file. In practice, this won't change a
thing, except for the case of compiling the kernel standalone w/o the
rest of a tree on a system that doesn't have
/usr/share/examples/etc/bsd-copyright installed.

sys/conf/newvers.sh

@@ -140,7 +140,6 @@ done
 if [ -z "$COPYRIGHT" ]; then
 	COPYRIGHT="/*-
  * Copyright (c) 1992-$year The FreeBSD Project.
- * All rights reserved.
  *
  */"
 fi