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/testcode/asynclook.c

@@ -64,7 +64,7 @@ struct track_id {
 	/** true if cancelled */
 	int cancel;
 	/** a lock on this structure for thread safety */
-	lock_basic_t lock;
+	lock_basic_type lock;
 };
 
 /**
@@ -164,7 +164,7 @@ struct ext_thr_info {
 	/** thread num for debug */
 	int thread_num;
 	/** thread id */
-	ub_thread_t tid;
+	ub_thread_type tid;
 	/** context */
 	struct ub_ctx* ctx;
 	/** size of array to query */
@@ -335,12 +335,17 @@ ext_thread(void* arg)
 		r = ub_wait(inf->ctx);
 		checkerr("ub_ctx_wait", r);
 	}
+	/* if these locks are destroyed, or if the async_ids is freed, then
+	   a use-after-free happens in another thread.
+	   The allocation is only part of this test, though. */
+	/*
 	if(async_ids) {
 		for(i=0; i<inf->numq; i++) {
 			lock_basic_destroy(&async_ids[i].lock);
 		}
 	}
 	free(async_ids);
+	*/
 	
 	return NULL;
 }
@@ -465,7 +470,7 @@ int main(int argc, char** argv)
 		return 1;
 	}
 
-	/* perform asyncronous calls */
+	/* perform asynchronous calls */
 	num_wait = argc;
 	for(i=0; i<argc; i++) {
 		lookups[i].name = argv[i];