Add stub for IoOpenDeviceRegistryKey(), needed for libusb-win32-0.1.2

[Uwe Bonnes]

Appended stub is needed for libusb-win32-0.1x 
-- 
Uwe Bonnes                bon at elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
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