PREV_RT_MAP
if ((tlmp = PREV_RT_MAP(nlmp)) == olmp)
NEXT(PREV_RT_MAP(olmp)) = (Link_map *)nlmp;
NEXT(PREV_RT_MAP(tlmp)) = (Link_map *)lmp;
NEXT(PREV_RT_MAP(lmp)) = (void *)NEXT(lmp);
lmc->lc_tail = PREV_RT_MAP(lmp);