[Cmake] Cmake custom build error, ${CMAKE} not defined

[Brad King]

> I changed a CMakeList.txt file and tried to rebuild my project without
> rerunning CMakeSetup.  I got the following error.  Is this a known
> issue?
Did you re-build CMakeSetupCMD?  It should be adding the CMAKE variable
and cache entry (if it isn't already there) when it gets run.  Is there a
CMAKE entry in your CMakeCache.txt file?  It won't show up in the GUI
because it is marked as INTERNAL.

-Brad