usb-device-manager: Set UsbDk backend on libusb 1.0.22
In libusb 1.0.21, UsbDk is enabled at compile time with --enable-usbdk option. In libusb 1.0.22, the backend is selected at runtime. This patch avoids a crash when spice client is compiled against libusb 1.0.22 and UsbDk is not installed. * Enabling dynamic backend selection in Windows https://github.com/libusb/libusb/commit/54884e84d024e761450287ab56aca #74 Signed-off-by:Victor Toso <victortoso@redhat.com> Acked-by:
Christophe Fergeau <cfergeau@redhat.com>