package/ijs: 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/ijs/ijs.hash

@@ -1,2 +1,3 @@
 # Locally computed:
 sha256	11a5f5084488c480f3ff5a24d64d7147bb64272bf60a0ba51330a56c5b50cab9  ijs-0.35.tar.bz2
+sha256	f723390b7ee019eccf07763dcb5744acf8bb43034bc3ba3d6f1c94440e365b4f  README