First stab at the ability to compile puttytel.exe, an SSH-free

First stab at the ability to compile puttytel.exe, an SSH-free
variant which is patent-safe in the US and legal in France and
Russia. This is a horrible hack in some ways: it's shown up serious
deficiencies in the module boundaries. Needs further work, probably
once the SSH implementations are recombined.

git-svn-id: svn://svn.tartarus.org/sgt/putty@410 cda61777-01e9-0310-a592-d414129be87e