gibber-namespaces: add GIBBER_XMPP_NS_X_OOB
gibber-namespaces: add GIBBER_XMPP_NS_X_OOB

freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut