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/iterator/iter_delegpt.h

@@ -81,6 +81,8 @@ struct delegpt {
 	uint8_t has_parent_side_NS;
 	/** for assertions on type of delegpt */
 	uint8_t dp_type_mlc;
+	/** use SSL for upstream query */
+	uint8_t ssl_upstream;
 };
 
 /**
@@ -355,7 +357,7 @@ void delegpt_no_ipv4(struct delegpt* dp);
 
 /** 
  * create malloced delegation point, with the given name 
- * @param name: uncompressed wireformat of degegpt name.
+ * @param name: uncompressed wireformat of delegpt name.
  * @return NULL on alloc failure
  */
 struct delegpt* delegpt_create_mlc(uint8_t* name);