libusb.h: Add missing LIBUSB_CLASS_ codes currently defined by usb.org

LIBUSB_CLASS_PHYSICAL
LIBUSB_CLASS_SMART_CARD
LIBUSB_CLASS_CONTENT_SECURITY
LIBUSB_CLASS_VIDEO
LIBUSB_CLASS_PERSONAL_HEALTHCARE
LIBUSB_CLASS_DIAGNOSTIC_DEVICE

Per http://www.usb.org/developers/defined_class
1 file changed