write test showing catastrophic fail with QT5+Win32, make fix(es).
Captured badly failing scenario in standalone test. CRUCIALLY: the test would work previously if you run it on a build server. The failures happen when running locally and windows loads different OpenGL traits. This fix gets rid of crashing / "invalid pixel format!" popup that is not correct. Windows API seems to say you're discouraged from calling DescribePixelFormat numerous times, thats probably why it returns null code here.