Microsoft recommends to use CoInitializeEx()
and SetWindowLongPtr()/GetWindowLongPtr() in new code.
Use COINIT_DISABLE_OLE1DDE to avoid overhead of
initializing and using obsolete technology.
Pick-to: 6.4
Change-Id: I9d16943e864d4487dd4f46fd9325579c298c52b9
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>