Ahem, let's not try initialising a static with a non-constant initialiser.

Also, I'm pretty sure that adding a source address to a remote SSH-2 forwarding
can never have worked, since we added an address string to the packet twice in
that case. OpenSSH 3.4p1 certainly doesn't like it (`Server has disabled port
forwarding' debug message). Fixed (and OpenSSH is happier now).

git-svn-id: svn://svn.tartarus.org/sgt/putty@4727 cda61777-01e9-0310-a592-d414129be87e