libiconv: add hash for license files

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libiconv/libiconv.hash

@@ -1,2 +1,6 @@
 # Locally calculated after checking pgp signature
 sha256	ccf536620a45458d26ba83887a983b96827001e92a13847b45e4925cc8913178	libiconv-1.15.tar.gz
+
+# Hash for license files:
+sha256	8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903	COPYING
+sha256	56bdea73b6145ef6ac5259b3da390b981d840c24cb03b8e1cbc678de7ecfa18d	COPYING.LIB