m4: add hash file

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/m4/m4.hash

@@ -0,0 +1,2 @@
+# Locally calculated after checking pgp signature
+sha256	f0543c3beb51fa6b3337d8025331591e0e18d8ec2886ed391f1aade43477d508	m4-1.4.17.tar.xz