Update Util subproject.

diff --git a/Util b/Util
index 4c7d47e6d1f215d4bfc50ccabd12cb2f014f2a13..56658b31ae811f8b80c617b7c6eff419b598904e 160000 (submodule)
--- a/Util
+++ b/Util
@@ -1 +1 @@
-Subproject commit 4c7d47e6d1f215d4bfc50ccabd12cb2f014f2a13
+Subproject commit 56658b31ae811f8b80c617b7c6eff419b598904e