[CMake] multicore interix'en testing

[Bill Hoffman]

I did not want to get into the technical thread on this issue, so I 
created a new message.  Markus, will you be able to run a dashboard for 
this platform?  It is sort of a requirement for accepting patches like 
this into CMake.  Otherwise, we are sure to break things in the future 
and not notice it.   Once we get all the tests passing we can help you 
setup a CDash client to submit nightly builds.

Thanks.

-Bill