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>

package/haveged/haveged.hash

@@ -1,2 +1,3 @@
 # Locally calculated
 sha256  c4959d3cb1fa6391d16a3aa1ba4d82cd3a0d497206ae4b87d638088c0664e5aa	haveged-1.9.4.tar.gz
+sha256  8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903	COPYING