Macros starting with 'r' in sys

• RB_CONTIGPUT sys/tty.h:67
• RB_LEN sys/tty.h:63
• RB_PRED sys/tty.h:60
• RB_ROLLOVER sys/tty.h:57
• RB_SUCC sys/tty.h:54
• remque sys/systm.h:86
• ROUNDDOWN sys/gprof.h:114
• roundup sys/param.h:177