package/bridge-utils: add hash for license file

Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/bridge-utils/bridge-utils.hash

@@ -1,2 +1,5 @@
 # From https://www.kernel.org/pub/linux/utils/net/bridge-utils/sha256sums.asc
 sha256 cc67efb5d5fb8928a6569b3fade2b4042ec17da04678dab127d96b46489e26c8 bridge-utils-1.6.tar.xz
+
+# locally computed
+sha256 995a31f60a9ddb4c609214cc7d17ca94cc3cbc7f37e1e64dba81e7f8ea9d4f91  COPYING