Upgrade unbound library

These files were pulled from the 1.6.3 release tarball.

This new version builds against OpenSSL version 1.1 which will be
the default in the new Debian Stable which is due to be released
RealSoonNow (tm).

external/unbound/util/data/packed_rrset.c

@@ -158,14 +158,14 @@ rrsetdata_equal(struct packed_rrset_data* d1, struct packed_rrset_data* d2)
 	return 1;
 }
 
-hashvalue_t 
+hashvalue_type
 rrset_key_hash(struct packed_rrset_key* key)
 {
 	/* type is hashed in host order */
 	uint16_t t = ntohs(key->type);
 	/* Note this MUST be identical to pkt_hash_rrset in msgparse.c */
 	/* this routine does not have a compressed name */
-	hashvalue_t h = 0xab;
+	hashvalue_type h = 0xab;
 	h = dname_query_hash(key->dname, h);
 	h = hashlittle(&t, sizeof(t), h);
 	h = hashlittle(&key->rrset_class, sizeof(uint16_t), h);