[CMake] [PATCH] BeOS support.

[Ryan C. Gordon]

> I thought that YellowTab by now would have a full POSIX implementation. 
> Your patch should theorically only be applied to BeOS 5.03. If you had 
> the time to double check, that would be fantastic.

I checked this over the weekend; YellowTab Zeta is definitely more POSIX 
compliant (but not 100% so), and I've sent Bill an updated patch to 
reflect this, so it does the right thing on both BeOS 5 and Zeta.

There are now daily tests of both Zeta and BeOS 5 being run here:

http://www.cmake.org/Testing/Dashboard/MostRecentResults-Nightly/Dashboard.html

(Both should pass that last failing test when the patches are in CVS.)

--ryan.