:wrench: ignore .o in util

diff --git a/util b/util
index 80a078b49aa86ebe64d5b0a35fbc463ec8f38470..3d53d2217a181950de245781dd0421bff3d10f4e 160000 (submodule)
--- a/util
+++ b/util
@@ -1 +1 @@
-Subproject commit 80a078b49aa86ebe64d5b0a35fbc463ec8f38470
+Subproject commit 3d53d2217a181950de245781dd0421bff3d10f4e