gain another 5+% in ip forwarding performance.

boring details:
skip looking for ipsec tags and descending into ip_spd_lookup if there
are no ipsec flows, except in one case in ip_output (spotted by markus)
where we have to if we have a pcb. ip_spd_lookup has the shortcut already,
but there is enough work done before so that skipping that gains us about
5%. ok theo, markus

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