Update submodules: util (new commits)

util:
    1d881ab Chris Smith <chris@dmdirc.com>
            Fix some redundent exceptions

            Gerrit: http://gerrit.dmdirc.com/3684

Change-Id: Ibe3e05e01a75c943da64c752dfd20b8048f0f6c5

modules/util

@@ -1 +1 @@
-Subproject commit 3796fcc88c981bca198db1c964288f441f7668a8
+Subproject commit 1d881ab4866275e152a75efe61f0047a5e8ba27e