launcher: don't try to switch to weston's vt

Signed-off-by: Giulio Camuffo <giuliocamuffo@gmail.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
diff --git a/libweston/launcher-impl.h b/libweston/launcher-impl.h
index 742721b..8d09025 100644
--- a/libweston/launcher-impl.h
+++ b/libweston/launcher-impl.h
@@ -34,6 +34,8 @@
 	void (* close) (struct weston_launcher *launcher, int fd);
 	int (* activate_vt) (struct weston_launcher *launcher, int vt);
 	void (* restore) (struct weston_launcher *launcher);
+	/* Get the number of the VT weston is running in */
+	int (* get_vt) (struct weston_launcher *launcher);
 };
 
 struct weston_launcher {