[mutter] clutter/stage-view: Export refresh rate getter symbol

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 20becd782f1631dc022e61be1829327bed26b91f
Author: Jonas Ådahl <jadahl gmail com>
Date:   Tue Jun 2 11:28:09 2020 +0200

    clutter/stage-view: Export refresh rate getter symbol
    
    To be used by tests.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1285

 clutter/clutter/clutter-stage-view-private.h | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/clutter/clutter/clutter-stage-view-private.h b/clutter/clutter/clutter-stage-view-private.h
index 71392f3551..e4132202e4 100644
--- a/clutter/clutter/clutter-stage-view-private.h
+++ b/clutter/clutter/clutter-stage-view-private.h
@@ -65,6 +65,7 @@ void clutter_stage_view_transform_rect_to_onscreen (ClutterStageView
 
 void clutter_stage_view_schedule_update (ClutterStageView *view);
 
+CLUTTER_EXPORT
 float clutter_stage_view_get_refresh_rate (ClutterStageView *view);
 
 void clutter_stage_view_notify_presented (ClutterStageView *view,