- drop `-'l' to prevent simulating a full login and running /root/.profile
(prodded by a mail from J Greely)
- use `-m' to preserve the environment because we now set HOME to "/" like
/etc/rc does; note that we now also clear the environment using `env -i' before
running su(1) which leaves us with only HOME, PATH and SHELL
Committing early to catch regressions fast, if any.
ok halex@