[CMake] use_mangled_mesa as a scriptable operation

[Alexander Neundorf]

On Thursday 03 March 2011, Harinarayan Krishnan wrote:
> Hi All,
>
> I would like to be able to script the cmake compatibility command
> use_mangle_mesa(mesapath/include/GL some_other_path).

Please put this in the cmake bug tracker, I'll take care of it.

Alex