[openbox] OpenBox 2.3.1 patch to build on Cygwin

[Scott Moynes]

* Walter Mundt (emage at spamcop.net) wrote:
> I hope these changes are acceptable and make it into the stable
> distribution, as having OpenBox on Cygwin is pretty cool.

After a cursory look, it looks alright to me. I will put it in my
patch pile. Hopefully it will resolve a few build issues on other
platforms.

Thanks.

-- 
Scott Moynes http://www.icculus.org/openbox/
"Computer science is as much about computers
as astronomy is about telescopes." -- Dijkstra