SSHv2 doesn't actually have compression levels

[Tobias Geerinckx-Rice]

Guix,

While reading (guix scripts offload) in a (failed) attempt to get 
offloading working, the following comment caught my eye:

 ;; We rely on protocol-level compression from libssh to optimize 
 large data
 ;; transfers.  Warn if it's missing.

which means that we're not currently doing our own compression 
inside the tunnel.

This is significant, because it means that the COMPRESS-LEVEL 
field of BUILD-MACHINE is completely bogus[0], and probably always 
was - unless it once supported SSHv1, which I think we can agree 
is not something we want to support today.  Nobody's offloading 
libreoffice to that old router in the attic.

I'd like to undocument the option, and add a comment noting its 
lack of any useful effect to the code, by next week.

Kind regards,

T G-R

[0]: Take a look at OpenSSH's readconf.c, packet.c, and all calls 
to start_compression_out().

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