jabber-auth: use the GCancellable if it's available
jabber-auth: use the GCancellable if it's available

noonien-d/wocky,freedesktop-unofficial-mirror/wocky,noonien-d/wocky,freedesktop-unofficial-mirror/wocky,freedesktop-unofficial-mirror/wocky,noonien-d/wocky