evaluate: attempt to set_eval flag if dynamic updates requested

evaluate: attempt to set_eval flag if dynamic updates requested

When passing no upper size limit, the dynset expression forces
an internal 64k upperlimit.

In some cases, this can result in 'nft -f' to restore the ruleset.
Avoid this by always setting the EVAL flag on a set definition when
we encounter packet-path update attempt in the batch.

Reported-by: Yi Chen <yiche@redhat.com>
Suggested-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Florian Westphal <fw@strlen.de>