s6-linux-init: add license hash

Signed-off-by: Eric Le Bihan <eric.le.bihan.dev@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/s6-linux-init/s6-linux-init.hash

@@ -1,2 +1,3 @@
 # Locally generated
 sha256 9ee2e8a5abc250bcb2be7d07566592ba5cbe3abce858f60853d3ac45b1ccdd79  s6-linux-init-0.3.1.1.tar.gz
+sha256 43cdbc05eceb0781d71a0661bbb6b9335efc4b733fbd02847c0c6667fd440993  COPYING