Log Message:
glib2: Update to 2.68.0

Revert to adam's commit

Overview of changes in GLib 2.68.0
==================================

* Bugs fixed:
 - !1987 build: Drop gconstructor_as_data_h usage from glib-compile-schemas
 - !1989 glib.supp: Generalize some suppressions
 - !1992 gbytesicon: Fix error in g_bytes_icon_new() documentation
 - !1994 glocalfileoutputstream: Tidy up error handling
 - !1995 tests: Fix copy/paste error in queue test

* Translation updates:
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 - Turkish