Glib compiled twice in Dockerfile
Our Dockerfile
compiles GLib twice, to get around the glib
-> glib-introspection
-> glib with introspection
circular dependency. With the newest version of GLib, it can generate it's own introspection data (see https://thisweek.gnome.org/posts/2023/10/twig-119/#glib).
We should thus drop the second compilation of GLib.