ip[6]tables: only call match's parse function when option char is in range

Normally, extensions use a "default:" case in switch(c) to just return
if they do not handle c. Apparently, libip6t_hl does that too late and
checks for hl-specific parsing state before it has established that c
refers to one of its own options.

Also affected: libipt_ttl, libxt_ipvs, libxt_policy, libxt_statistic.

One way to fix this is to move the flags checks into case '2', '3',
'4'. Doing this replication feels bad, so as an alternative, let's
just free extensions from having to deal with other extension's
options passing thru.

References: http://marc.info/?l=netfilter-devel&m=129444759532377&w=2
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>

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