package: Add libiqrf package

Libiqrf is library written in C which implement specific iqrf
protocol to communicate with iqrf usb devices (http://iqrf.org

).

[Peter: select libusb, fix Config.in indentation]
Signed-off-by: Marek Belisko <marek.belisko@open-nandra.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>