iptables/extensions: make bundled options work again

When using a bundled option like "-ptcp", 'argv[optind-1]' would
logically point to "-ptcp", but this is obviously not right.
'optarg' is needed instead, which if properly offset to "tcp".

Not all places change optind-based access to optarg; where
look-ahead is needed, such as for tcp's --tcp-flags option for
example, optind is ok.

References: http://bugzilla.netfilter.org/show_bug.cgi?id=611
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>

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