package/libusb-compat: add license hash

Partly fixes:
http://autobuild.buildroot.net/results/f0f/f0fd05ce8a8b595015baf625481b58967df53458/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libusb-compat/libusb-compat.hash

@@ -1,2 +1,3 @@
 # Locally computed:
 sha256  404ef4b6b324be79ac1bfb3d839eac860fbc929e6acb1ef88793a6ea328bc55a  libusb-compat-0.1.5.tar.bz2
+sha256  5df07007198989c622f5d41de8d703e7bef3d0e79d62e24332ee739a452af62a  COPYING