Tests: userid TODO adjusted, fix committed.

userid.t

diff --git a/userid.t b/userid.t
index 5578eb3..80e3874 100644
--- a/userid.t
+++ b/userid.t
@@ -228,7 +228,7 @@
 is(substr(uid_set(http_get('/ip6')), 0, 8), $addr, 'service ipv6');
 
 TODO: {
-local $TODO = 'not yet';
+local $TODO = 'not yet' unless $t->has_version('1.15.8');
 
 is(substr(uid_set(http_get('/unix')), 0, 8), "00000000", 'service unix');