The windows.h include is not needed, the enums are properly known to
the metaobject system nowadays, and qprocess_p.h already has a
QT_NO_PROCESS guard.
Change-Id: I6bbdce19f097feb8260c51a29425279049aa0192
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>