[tor-dev] .i2p address support in torsocks

[Greg Troxel]

I think i2p support makes sense.  The only tricky part is what prereqs
that reuuires.  For an individual building torsocks, they'll either have
or not have tor and have or not have i2p, and they can be detected, and
that's fine.  For a packaging system, the package has to have
dependencies chosen, and this leaves the packager choosing wither to
leave something out or inflict the dependency on everyone.

If torsocks doesn't need tor installed, because it just uses socks5, and
similarly for i2p, then there's no issue - this sounds good.