Questionable command line defines for Cygwin/XFree86

[Harold Hunt]

Rob,

Up until now I have only been working on the DDX layer of the port; I have
only recently begun to look at the OS layer.  Therefore, I can't really tell
you anything that you don't already know; in fact, I'll probably need you to
tell me things :)

Any changes you want to make are fine with me, and I'll try to give you
pointers to locations where I see something that appears to be missing
thread support.

Thanks for helping on thread support,

Harold