iptables: fix disable-ipv6 option

- bumb version to v1.4.5
- add fix for --disable-ipv6 option
  (upstream bug: http://bugzilla.netfilter.org/show_bug.cgi?id=608

)

Signed-off-by: Olaf Rempel <razzor@kopf-tisch.de>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>