Defines starting with `f' in machdep/ppc

• FALIGNMENT machdep/ppc/asm.h:84
• fbufA machdep/ppc/bcopy.s:101
• fbufB machdep/ppc/bcopy.s:102
• fbufC machdep/ppc/bcopy.s:103
• FREE_REGION_MAX machdep/ppc/pmap_internals.h:104
• fromDEC machdep/ppc/nkdefs.h:35
• fromRTCL machdep/ppc/nkdefs.h:30
• fromRTCU machdep/ppc/nkdefs.h:29