package/gettext: add license hash

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/gettext/gettext.hash

@@ -1,3 +1,5 @@
 # From http://lists.gnu.org/archive/html/bug-gettext/2016-06/msg00008.html
 md5	df3f5690eaa30fd228537b00cb7b7590	gettext-0.19.8.1.tar.xz
 sha1	e0fe90ede22f7f16bbde7bdea791a835f2773fc9	gettext-0.19.8.1.tar.xz
+# License files, locally calculated
+sha256	8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903	COPYING