[CMake] Creating a visual studio project with non .cpp or .h files in it.

[Bill Hoffman]

Josef Karthauser wrote:
> It would be useful if there was a standard way of doing this within
> CMake; maybe there is in 2.6?
> 
> Anyway, I boiled your ideas down into a single 'ADD_DOCUMENTATION()'
> command - see attached patch to 2.4.7.  It should probably be called
> ADD_AUX_FILE() or something though, as we also use it to add external
> foo.cmake files to the visual project files for ease of editing within
> the Visual Studio environment.
> 

Actually, I would think that the right way to do this would be to allow 
for custom targets to have sources.  I don't think we need a whole new 
command for this.

-Bill