Patch for SOCKS4A in OpenSsh

[Dan Kaminsky]

Winton--

    Excellent!  Absolutely wonderful.

    I'm wondering which apps/encapsulators support 4A?  This gets me around
the DNS leakage problem quite nicely.

    Incidentally, we do need SOCKS5 support -- if for no other reason, the
fact that there's *operating system* level support in OSX for SOCKS5
redirection.  So OpenSSH can become a completely transparent VPN system in
OSX w/ SOCKS5.

    Even without OSX, a decent number of apps only support SOCKS5 proxying.

--Dan