rule: remove redundant meta protocol from the evaluation step

rule: remove redundant meta protocol from the evaluation step

567ea4774e13 ("netlink_delinearize: incorrect meta protocol dependency kill")
does not document two cases that are handled in this patch:

- 'meta protocol ip' is removed if used in the ip family.
- 'meta protocol ip6' is removed if used in the ip6 family.

This patch removes this redundancy earlier, from the evaluation step
before netlink bytecode generation.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>