codegen: Emit G_DEFINE_AUTOPTR_CLEANUP_FUNC() for classes
codegen: Emit G_DEFINE_AUTOPTR_CLEANUP_FUNC() for classes

This requires --target-glib=2.44

Fixes https://gitlab.gnome.org/GNOME/vala/issues/670

GNOME/vala,frida/vala,frida/vala,frida/vala,frida/vala,GNOME/vala,GNOME/vala,GNOME/vala,frida/vala