[CMake] Policies in generate step

[Dominik Bernhardt]

I'm using the latest master branch on Windows and I have the  
impression that whatever I set for policies, the setting is ignored in  
the generate step.
Everything works fine for policies influencing the configure step.  
However in the generate step I get warnings about undefined policies  
although I have defined them at the beginning of my toplevel  
CMakeLists.txt file.

Can anyone comment on whether there is a difference between configure  
and generate step regarding policies?

Dominik