libgsystem: Update to latest

diff --git a/src/libgsystem b/src/libgsystem
index 5166164a282bcd77997f94962acf66be2d302aae..51736db5f49b4b798fd2f9d0ccb8eff453105162 160000 (submodule)
--- a/src/libgsystem
+++ b/src/libgsystem
@@ -1 +1 @@
-Subproject commit 5166164a282bcd77997f94962acf66be2d302aae
+Subproject commit 51736db5f49b4b798fd2f9d0ccb8eff453105162