[NETFILTER]: ipt_SAME: add compat conversion functions

ipt_SAME should have the compat function cause its entry structure (ipt_same_info)
contains a pointer between data filled/checked in both kernel and userspace.

Signed-off-by: Konstantin Khorenko <khorenko@sw.ru>

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Thank you,
	Konstantin Khorenko

SWsoft Virtuozzo/OpenVZ Linux kernel team