[CMake] How to change/set default generator

[David Genest]

> Don't both CMake GUIs remember the last chosen generator in the event
> you
> are configuring a new build?

Yes, once configured the gui and cmake use the chosen generator. I was
probably unclear. I would like to configure cmake so that the first call
of cmake on the command line on a new project without a -G parameter
uses the "Visual Studio 9 2008" by default.