[vtkusers] Coexistence of different Win32 libraries

[Kenneth Porter]

On Win32, I want to build both release and debug libraries for both VS2005 
and VS2008. I've run CMake twice to output to different VS2005 and VS2008 
directories, and set the install path to distinct directories. But I don't 
see how to get both debug and release versions without using distinct build 
and install directories for each (ie. running CMake 4 times to create 4 
completely different builds). Is there a CMake variable to build the debug 
versions with a "d" suffix, for example?