cerbero: Fix platform detection on Windows
cerbero: Fix platform detection on Windows

Detecting the 'native' architecture of Windows is not a trivial task.
We cannot trust that the architecture that Python is built for is the
'native' one because you can run 32-bit apps on 64-bit Windows using
WOW64 and people sometimes install 32-bit Python on 64-bit Windows.

justinjoy/cerbero,nirbheek/cerbero,flexVDI/cerbero,flexVDI/cerbero,justinjoy/cerbero,GStreamer/cerbero,atsushieno/cerbero,OptoFidelity/cerbero,fluendo/cerbero,GStreamer/cerbero,centricular/cerbero,OptoFidelity/cerbero,flexVDI/cerbero,nirbheek/cerbero,fluendo/cerbero,fluendo/cerbero,GStreamer/cerbero,fluendo/cerbero,EricssonResearch/cerbero,atsushieno/cerbero,centricular/cerbero,EricssonResearch/cerbero,EricssonResearch/cerbero,OptoFidelity/cerbero,OptoFidelity/cerbero,atsushieno/cerbero,justinjoy/cerbero,nirbheek/cerbero,GStreamer/cerbero,fluendo/cerbero,nirbheek/cerbero,justinjoy/cerbero,EricssonResearch/cerbero,atsushieno/cerbero,EricssonResearch/cerbero,centricular/cerbero,flexVDI/cerbero,atsushieno/cerbero,centricular/cerbero,GStreamer/cerbero,centricular/cerbero,flexVDI/cerbero