HEADS UP - Changes to APIC_IO in master

[Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>]

    For people tracking master please note that we have removed the
    APIC_IO kernel config option.  It is now a tunable which defaults
    to enabled.

    If you are tracking the master branch and your system will not boot
    with APIC_IO you need to place the following tunable in your
    /boot/loader.conf:

	hw.apic_io_enable=0

    This change gets us closer to being able to boot a SMP build on a UP
    machine, which will reduce confusion in later releases.  We aren't
    quite there yet.

					-Matt
					Matthew Dillon 
					<dillon@backplane.com>