iptables: Replace ALIGN macro with XT_ALIGN macro.
XT_ALIGN macro should be used instead of explicit ALIGN macro to define struct alignments. In Linux kernel netfilter code it has been used for IPv6 structs (kernel commit 06e1374a7ed45f1788353a2944a20133adc55649) and the commonly used IPT_ALIGN(s) usually is defined to use XT_ALIGN as well and has been renamed as XT_ALIGN in iptables 1.4.11. XT_ALIGN is defined in linux/netfilter/x_tables.h, included via xtables.h.
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