Update libgsystem

diff --git a/src/libgsystem b/src/libgsystem
index 4a41cb7911ac97eeac297a3177375b8198a433d2..939cd18d39b1abf39543c83c406246b12dbfa03a 160000 (submodule)
--- a/src/libgsystem
+++ b/src/libgsystem
@@ -1 +1 @@
-Subproject commit 4a41cb7911ac97eeac297a3177375b8198a433d2
+Subproject commit 939cd18d39b1abf39543c83c406246b12dbfa03a