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/sldns/rrdef.h

@@ -182,6 +182,8 @@ enum sldns_enum_rr_type
 	LDNS_RR_TYPE_NSEC3PARAM = 51, /* RFC 5155 */
 	LDNS_RR_TYPE_NSEC3PARAMS = 51,
 	LDNS_RR_TYPE_TLSA = 52, /* RFC 6698 */
+	LDNS_RR_TYPE_SMIMEA = 53, /* draft-ietf-dane-smime, TLSA-like but may
+				     be extended */
 
 	LDNS_RR_TYPE_HIP = 55, /* RFC 5205 */
 
@@ -193,6 +195,8 @@ enum sldns_enum_rr_type
         LDNS_RR_TYPE_TALINK = 58,
 	LDNS_RR_TYPE_CDS = 59, /** RFC 7344 */
 	LDNS_RR_TYPE_CDNSKEY = 60, /** RFC 7344 */
+	LDNS_RR_TYPE_OPENPGPKEY = 61, /* RFC 7929 */
+	LDNS_RR_TYPE_CSYNC = 62, /* RFC 7477 */
 
 	LDNS_RR_TYPE_SPF = 99, /* RFC 4408 */
 
@@ -368,6 +372,8 @@ enum sldns_enum_algorithm
         LDNS_ECC_GOST           = 12,  /* RFC 5933 */
         LDNS_ECDSAP256SHA256    = 13,  /* RFC 6605 */
         LDNS_ECDSAP384SHA384    = 14,  /* RFC 6605 */
+	LDNS_ED25519		= 15,  /* RFC 8080 */
+	LDNS_ED448		= 16,  /* RFC 8080 */
         LDNS_INDIRECT           = 252,
         LDNS_PRIVATEDNS         = 253,
         LDNS_PRIVATEOID         = 254
@@ -416,7 +422,9 @@ enum sldns_enum_edns_option
 	LDNS_EDNS_DAU = 5, /* RFC6975 */
 	LDNS_EDNS_DHU = 6, /* RFC6975 */
 	LDNS_EDNS_N3U = 7, /* RFC6975 */
-	LDNS_EDNS_CLIENT_SUBNET = 8 /* draft-vandergaast-edns-client-subnet */
+	LDNS_EDNS_CLIENT_SUBNET = 8, /* RFC7871 */
+	LDNS_EDNS_KEEPALIVE = 11, /* draft-ietf-dnsop-edns-tcp-keepalive*/
+	LDNS_EDNS_PADDING = 12 /* RFC7830 */
 };
 typedef enum sldns_enum_edns_option sldns_edns_option;