openssh 4.2p1 zlib compression broken for old clients

[Markus Friedl]

allowing zlib compresison is a server side risk.

delaying compression until the user is authenticated reduces
the server side risk.

i don't see why the code should change.

if it's a problem, then only in the documentation:

     Compression
             Specifies whether compression is allowed, or delayed until the
             user has authenticated successfully.  The argument must be
             ``yes'', ``delayed'', or ``no''.  The default is ``delayed''.