forwards_delete_stub_hole
void forwards_delete_stub_hole(struct iter_forwards* fwd, uint16_t c,
forwards_delete_stub_hole(fwd, LDNS_RR_CLASS_IN, nm, nolock);
forwards_delete_stub_hole(fwd, LDNS_RR_CLASS_IN, nm, nolock);
void forwards_delete_stub_hole(struct iter_forwards* fwd, uint16_t c,