util-linux: add hash

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/util-linux/util-linux.hash

@@ -0,0 +1,2 @@
+# From https://www.kernel.org/pub/linux/utils/util-linux/v2.25/sha256sums.asc
+sha256	4701305ae22790c3a92ce48e50794fa05b7ee01f4227f419a171c100d08986e8	util-linux-2.25.1.tar.xz