The 2.5 version branched from 2.4.5 or so, and since then
a couple hardware-specific tweaks were merged to 2.4; this
teaches 2.5 about NatSemi SUPERIO and PA-RISC quirks.

This also uses os/version neutral HCD calls to register the root
hub and find the HCD's bus.  It also adds os/version neutral
macros for its diagnostic macros.  Most of those changes have
been split out separately, but the macros and a few uses of them
weren't naturally splittable.

Also a couple minor cleanups, like removing CVS ids, having
only one copy of a routine used with the debug files, and
getting rid of some inline #ifdefs.