[gtk/dnd-gestures-2] Properly export GtkDragIcon

[Matthias Clasen <matthiasc src gnome org>]

commit c941a2d9c6b6be612f42a26c8f5cff7a9a4c2b7c
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jan 9 00:30:41 2020 -0500

    Properly export GtkDragIcon
    
    The get_type function was missing.

 gtk/gtkdragicon.h | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gtk/gtkdragicon.h b/gtk/gtkdragicon.h
index 416dcd1775..b8d7ffb38a 100644
--- a/gtk/gtkdragicon.h
+++ b/gtk/gtkdragicon.h
@@ -34,6 +34,7 @@ G_BEGIN_DECLS
 
 #define GTK_TYPE_DRAG_ICON (gtk_drag_icon_get_type ())
 
+GDK_AVAILABLE_IN_ALL
 G_DECLARE_FINAL_TYPE (GtkDragIcon, gtk_drag_icon, GTK, DRAG_ICON, GtkContainer)
 
 GDK_AVAILABLE_IN_ALL