package/ltris: 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/ltris/ltris.hash

@@ -1,2 +1,3 @@
 # Locally computed:
 sha256  8f6a9e7719d22004aee153db29ffd9ca41c7a6cd87fc791591994eecc2e625a1  ltris-1.0.19.tar.gz
+sha256  67f82e045cf7acfef853ea0f426575a8359161a0a325e19f02b529a87c4b6c34  COPYING