attr: add hash file

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/attr/attr.hash

@@ -0,0 +1,2 @@
+# Locally calculated after checking pgp signature
+sha256	25772f653ac5b2e3ceeb89df50e4688891e21f723c460636548971652af0a859	attr-2.4.47.src.tar.gz