Sync with a known NetBSD copy
Wrap the RISC OS-isms with #ifdef __riscos, and some noisy tab/whitespace changes. Removed sc_sense from umass_softc (never set), was added in SCSISoftUSB-0_07, but appears to be left over from a future version - it'll be back later. Contemporary with umass.c revision 1.95 from NetBSD. Tagged as SCSISoftUSB-0_25-netbsd-1_95.
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