RDB's patch:

RDB's patch:
 - `local ldisc' config option now switches between PuTTY's original
   behaviour when off (aggressively start negotiations, never use
   local line discipline) and Unix telnet's off-port-25 behaviour
   when on (wait to be negotiated with, toggle local line discipline
   when TELOPT_ECHO changes)
 - SYNCH handling has been improved again, though it may still be
   broken due to WinSock being irretrievably pants

git-svn-id: svn://svn.tartarus.org/sgt/putty@420 cda61777-01e9-0310-a592-d414129be87e