codegen: Use g_enum/flags_to_string while targeting glib >= 2.54
codegen: Use g_enum/flags_to_string while targeting glib >= 2.54

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