[CMake] Makefile generator and header files in 2.8.8

[David Nadlinger]

In our project, we are explicitly adding all the header files along with 
the source files to the respective build targets in order for them to 
show up in CMake-generated Visual C++ projects.

Up to and including 2.8.7, this worked well as the Makefile generator 
simply ignored the header files, but starting with 2.8.8, this no longer 
seems to be the case.

Is this a (known?) bug, or a deliberate change in behavior? If the 
latter is the case, what is the suggested way to include header files 
with the generated workspaces?

Thanks,
David