Tests: adjusted resolver TODO, fix committed.

http_resolver.t

diff --git a/http_resolver.t b/http_resolver.t
index 58a42ed..057ca89 100644
--- a/http_resolver.t
+++ b/http_resolver.t
@@ -205,7 +205,7 @@
 	'valid expired');
 
 TODO: {
-local $TODO = 'not yet';
+local $TODO = 'not yet' unless $t->has_version('1.5.9');
 
 # Ensure that resolver respects expired CNAME in CNAME + A combined response.
 # When ttl in CNAME is expired, the answer should not be served from cache.