Defines starting with `r' in src/od-amiga

• refptr src/od-amiga/amiga-kludges.h:98
• RESULT_LEN src/od-amiga/ami-rexx.c:69
• romend src/od-amiga/amiga-kludges.h:35
• romstart src/od-amiga/amiga-kludges.h:36