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The comment module is compiled out on several embedded systems (and also gentoo, because netfilter can't go brrrr with comments holding it back). Attempting to use comments results in a confusing error, and a non-functional firewall. Additionally, make the legacy rule cleanup non-fatal, because we *do* have to probe for the existence of these -m comment rules, and doing so will error out on these systems. Signed-off-by: David Anderson <danderson@tailscale.com>