nft: arptables: remove obsolete forward hook definition

Its not supported anymore as of 4.13, and it did not work
before this either (arp packets cannot be routed).
This unbreaks arptables-compat -- without this fix kernel rejects the
incoming ruleset skeleton.

filtering forwarded arp packets on a bridge can be done either via
'netdev' or 'bridge' families.

Signed-off-by: Florian Westphal <fw@strlen.de>
1 file changed