[PATCH nftables 0/2] add minimal x_tables output support

[Florian Westphal <fw@xxxxxxxxx>]

Currently when building nftables without xtables support, then
any nft_compat expression is silently skipped.

This adds minimal support so we will at least be able to print
out that an xtables match is in use in a rule.

Example:
oifname "eth0" # xt_policy counter packets 0 bytes 0 accept

for a rule added via
  iptables-nft -A OUTPUT -m policy ...