Update libgsystem

Just to test the new code.

diff --git a/src/libgsystem b/src/libgsystem
index 4d7415264738f03e4e72600b24883adc93d7307a..aaa4e8623c578a1cf385f615ebd9713b5c18afa0 160000 (submodule)
--- a/src/libgsystem
+++ b/src/libgsystem
@@ -1 +1 @@
-Subproject commit 4d7415264738f03e4e72600b24883adc93d7307a
+Subproject commit aaa4e8623c578a1cf385f615ebd9713b5c18afa0