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/dname.h

@@ -127,7 +127,7 @@ int dname_pkt_compare(struct sldns_buffer* pkt, uint8_t* d1, uint8_t* d2);
  * @param h: initial hash value.
  * @return: result hash value.
  */
-hashvalue_t dname_query_hash(uint8_t* dname, hashvalue_t h);
+hashvalue_type dname_query_hash(uint8_t* dname, hashvalue_type h);
 
 /**
  * Hash dname, label by label, lowercasing, into hashvalue.
@@ -139,7 +139,8 @@ hashvalue_t dname_query_hash(uint8_t* dname, hashvalue_t h);
  * @return: result hash value.
  * 	Result is the same as dname_query_hash, even if compression is used.
  */
-hashvalue_t dname_pkt_hash(struct sldns_buffer* pkt, uint8_t* dname, hashvalue_t h);
+hashvalue_type dname_pkt_hash(struct sldns_buffer* pkt, uint8_t* dname,
+	hashvalue_type h);
 
 /**
  * Copy over a valid dname and decompress it.