actually currently required. Suggested by Charles M. Hannum.
(currently only CD-ROM drives on i386). The sys/dev/scsipi system provides 2 busses to which devices can attach (scsibus and atapibus). This needed to change some include files and structure names in the low level scsi drivers.
- Fix prototypes - Fix PR/2248 [Problems with HP scanjet...]
hacked a bit. Needs more work.