msys python vs mingw python issues on windows.

I have been trying to get a gstreamer build environment up and running on windows. One of the issues I ran into was that when running the cerbero bootstrapper it would fail to detect my windows version.

Investigation showed that the call to platform.win32_ver() in cerbero/utils/init.py returns blank values when using the default msys python.

Running the bootstrapper with /mingw64/bin/python3 ./cerbero-uninstalled bootstrap resolved this issue.

Part of the issue is that I had already installed msys and mingw64, but not using the recommend http://sourceforge.net/projects/mingw/files/Installer/mingw-get-setup.exe/download link.

It would have saved me a lot of time if the bootstrapper had detected me running the incorrect instance of python. :)