[issue1521] amd64 2.4 livecd won't mount root at boot

[Matthew Dillon]

    We've found the issue with USB disk keys on 64-bit not working.  ACPI
    was not preloading properly.  And it is possible that the missing ACPI
    might also be responsible for the CD/DVD problems.

    I should have a new ISO and usb disk key image for 64-bit available for
    test in another day or two.  I don't have a binary diff though.

						-Matt