xshared: Share a common printhelp function

Help texts in legacy and nft variants are supposed to be identical, but
those of iptables and ip6tables largely overlapped already. By referring
to xt_params and afinfo pointers, it is relatively trivial to craft a
suitable help text on demand, so duplicated help texts can be
eliminated.

As a side-effect, this fixes ip6tables-nft help text - it was identical
to that of iptables-nft.

Signed-off-by: Phil Sutter <phil@nwl.cc>

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