RE: Check if J-PAKE enabled?

You should be able to cross reference your existing build with the source from cygwin here:

http://cygwin.com/packages/openssh/

and

ftp://ftp.cygwin.com/pub/cygwin/release/openssh/

and verify if it's enabled or not, and even if it's enabled, if a fix has been included.
(the makefile should have pretty good descriptions of what options were used for the binary package).

Thanks,
Jok