Update STK Makefile

diff --git a/plug b/plug
index e484995a51471a0b2b6040328f2d380268ee5fe0..bce37d1cdb865afe294961485ae8ea523bbd6577 160000 (submodule)
--- a/plug
+++ b/plug
@@ -1 +1 @@
-Subproject commit e484995a51471a0b2b6040328f2d380268ee5fe0
+Subproject commit bce37d1cdb865afe294961485ae8ea523bbd6577