tslib: add the hash for the COPYING license file

Since tslib's COPYING file in part of the source tree, we can easily
include it's hash for the given version here.

Signed-off-by: Martin Kepplinger <martink@posteo.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/tslib/tslib.hash

@@ -1,2 +1,5 @@
 # https://github.com/kergoth/tslib/releases/download/1.13/tslib-1.13.tar.xz.sha256
 sha256  b381279f2d6ad6acb80cfc4852860853b7bcd1a9440821e9fe920c33f4e4f8da  tslib-1.13.tar.xz
+
+# Locally computed
+sha256  9b872a8a070b8ad329c4bd380fb1bf0000f564c75023ec8e1e6803f15364b9e9  COPYING