Sync libucl.

diff --git a/src/ucl b/src/ucl
index 8b0d3d41ff15a84a1fa264771c9e26c2df250922..9491d5c401c853adaf893c45c693bc08630d9076 160000 (submodule)
--- a/src/ucl
+++ b/src/ucl
@@ -1 +1 @@
-Subproject commit 8b0d3d41ff15a84a1fa264771c9e26c2df250922
+Subproject commit 9491d5c401c853adaf893c45c693bc08630d9076