Defines starting with `s' in bsd/dev/ppc

• SAFE_IPL bsd/dev/ppc/PPCKeyboard.m:97
• SCREENTOKEN bsd/dev/ppc/ev_private.h:120
• si bsd/dev/ppc/keycodes.h:55
• so bsd/dev/ppc/keycodes.h:54
• soh bsd/dev/ppc/keycodes.h:41
• SPECIALKEYS_MODIFIER_MASK bsd/dev/ppc/ev_private.h:107
• stx bsd/dev/ppc/keycodes.h:42
• sub bsd/dev/ppc/keycodes.h:66
• syn bsd/dev/ppc/keycodes.h:62