[Qt-creator] patch for improving cmake support with mingw

[Daniel Teske]

>
> I have tried to use qtcreator's support for cmake under windows/mingw,
> and I have encountered the following problems:
>  - the generator uses the "CodeBlocks - Unix Makefiles" generator.
> However, this generator does not works under windows, so an empty
> project is opened in qt-creator
>  - when starting a build, the plugin tries to launch "make". The
> default make that is included in mingw is "mingw32-make"
>
> The attached diff uses #ifdef Q_OS_WIN to replace "CodeBlocks - Unix
> Makefiles" and "make" by "CodeBlocks - MinGW Makefiles" and
> "mingw32-make" under windows, which seems to fix the problem.
> There is also a fix for an uninitialized member variable in makestep.cpp.

Thanks, note though that I obviously don't test it on windows at the moment.
And all of it is rather alpha quality at the moment. 
If you have any feedback what is most needed for you, I'd be interested in 
that.

daniel