package/haveged: fix legal-info
Add hash for COPYING file
Fixes:
$: make haveged-legal-info
>>> haveged 1.9.4 Collecting legal info
ERROR: No hash found for COPYING
Signed-off-by: Pierre-Jean Texier <pjtexier@koncepto.io>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>