iptables-legacy: Drop redundant include of xtables-multi.h

The header is included unconditionally first, so no point in doing it a
second time of ENABLE_NFTABLES is defined.

Fixes: be70918eab26e ("xtables: rename xt-multi binaries to -nft, -legacy")
Signed-off-by: Phil Sutter <phil@nwl.cc>
1 file changed