iputils: Add hash for ninfod/COPYING license file

Signed-off-by: Petr Vorel <petr.vorel@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/iputils/iputils.hash

@@ -1,2 +1,3 @@
 # Locally computed
 sha256 da14105291dd491f28ea91ade854ed10aee8ba019641c80eed233de3908be7c5  iputils-s20180629.tar.gz
+sha256 966075293e45785230c19415bcda15bd07c75bead4fe73332d1a4b9c45bb321f  ninfod/COPYING