Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.Approved by: re (implicit)Sponsored by: The FreeBSD Foundation
Make nl(1) build with WARNS=6.Obtained from: NetBSD
Build usr.bin/ with WARNS=6 by default.Also add some missing $FreeBSD$ to keep svn happy.
Add nl(1)PR: 27078Obtained from: NetBSD