package/logrotate: fix legal-info

Add hash for COPYING file

Fixes:

$: make logrotate-legal-info
 >>> logrotate 3.15.0 Collecting legal info
 ERROR: No hash found for COPYING

Signed-off-by: Pierre-Jean Texier <pjtexier@koncepto.io>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/logrotate/logrotate.hash

@@ -1,2 +1,3 @@
 # Locally calculated
 sha256 011b9e2c7dc785f702f960dc15b7871bd46e53a9a6e336299e4f3d22022986fd  logrotate-3.15.0.tar.gz
+sha256 8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643  COPYING