Add a weston_pointer_axis_event

Use an event struct to pass axis events around. This helps dealing with the
upcoming axis discrete changes.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Jonas Ådahl <jadahl@gmail.com>
diff --git a/src/screen-share.c b/src/screen-share.c
index 92a91d6..ab649e3 100644
--- a/src/screen-share.c
+++ b/src/screen-share.c
@@ -160,8 +160,12 @@
 		    uint32_t time, uint32_t axis, wl_fixed_t value)
 {
 	struct ss_seat *seat = data;
+	struct weston_pointer_axis_event weston_event;
 
-	notify_axis(&seat->base, time, axis, value);
+	weston_event.axis = axis;
+	weston_event.value = value;
+
+	notify_axis(&seat->base, time, &weston_event);
 }
 
 static const struct wl_pointer_listener ss_seat_pointer_listener = {