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>
Pierre-Jean Texier