glnx: Update from master

More autocleanup backports, this time GFileOutputStream.

diff --git a/libglnx b/libglnx
index e684ef07f03dd563310788c90b3cdb00bac551eb..7e24c244ffb3c1b7825c9e45dbf2806b86e46f95 160000 (submodule)
--- a/libglnx
+++ b/libglnx
@@ -1 +1 @@
-Subproject commit e684ef07f03dd563310788c90b3cdb00bac551eb
+Subproject commit 7e24c244ffb3c1b7825c9e45dbf2806b86e46f95