Make sure broadcast entries won't be freed by the arp timer so we can use them for address lookups.
Make sure broadcast entries won't be freed by the arp timer so we can
use them for address lookups.

While here do let in_arpinput() overwrite local or broadcast entries.

ok mikeb@, florian@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars