[CMake] GUIDs, Dependencies, and INCLUDE_EXTERNAL_MSPROJECT

[Timothy Bryant]

I'm using INCLUDE_EXTERNAL_MSPROJECT with dependencies.  The generated 
solution file creates new GUIDs for these external projects which do not 
match the GUIDs inside the respective project files.

I have two different minor builds of Visual Studio 8 and they seem to 
handle this situation differently.  One VS8 will reassign the project 
GUID from the solution file (modifying the project files when the 
solution is closed).  The other VS8 does not and as a result the project 
dependencies are ignored.

Any help would be appreciated.

-Tim