now that receive ring accounting has been pulled out of the mbuf layer,
we can pull the space the mbuf layer used to do per interface accounting
out of struct if_data.

saves a hundredish bytes on every interface.

ok deraadt@ claudio@
check for existance of rc.shutdown, before sourcing it
Convert syslog_r(3) to using sendsyslog(2).  This ensures that syslog_r(3)
can be used anywhere (signal handler, stack protector fault handler) as
long as the format string does not contain floating point.
ok tedu miod beck
crank major for syslog_r(3) using sendsyslog(2).  new kernel needed, too.
Now that we have sendsyslog(2), we can directly use it in the
(previously completely retarded) stack_smash_handler of ld.so
ok beck miod tedu
Create a socketpair() and tie one end to /dev/klog using ioctl LIOCSFD.
This allows us to receive messages direct from programs using the
fd-safe sendsyslog(2), aka. syslog_r(3).  Thanks to guenther for this part
of the solution.
ok beck tedu miod guenther