Update libucl.

diff --git a/src/ucl b/src/ucl
index 006dd46060d6aa44191a3e404b975ba93bfb9b99..3e1ff238ab86fdb951b2664c25563414a84ce0c9 160000 (submodule)
--- a/src/ucl
+++ b/src/ucl
@@ -1 +1 @@
-Subproject commit 006dd46060d6aa44191a3e404b975ba93bfb9b99
+Subproject commit 3e1ff238ab86fdb951b2664c25563414a84ce0c9