gchecksum: don't break ABI by inserting new enum member in the middle
gchecksum: don't break ABI by inserting new enum member in the middle

Signed-off-by: Igor Gnatenko <71fb2d16c26f553767b965fdac40e83622cad277@src.gnome.org>

johne53/MB3Glib,johne53/MB3Glib,endlessm/glib,johne53/MB3Glib,endlessm/glib,johne53/MB3Glib,johne53/MB3Glib,johne53/MB3Glib,endlessm/glib,endlessm/glib,endlessm/glib