information (no one else can vipw(8), chpass(1), or even passwd(1)),
either on purpose or by accident, until an administrator manually
intervened. Instead, do not lock the master.passwd file while a user
is editing his information. But once we go to write the new
information, check that the modified user's information has not
changed in the password database since we started. Abort the changes
if it has.
Add a $FreeBSD$ to pw_copy.h.
PR: i386/35816
Obtained from: NetBSD
MFC after: 1 week
