[gtk/function-annotations: 4/17] Annotate gdk_unichar_direction as const

[Matthias Clasen <matthiasc src gnome org>]

commit ebca260f2d16c4977d69bc76df5b00f5fca8afa7
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Sep 14 12:19:13 2021 -0400

    Annotate gdk_unichar_direction as const

 gdk/gdk-private.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gdk/gdk-private.h b/gdk/gdk-private.h
index 3701d51198..4ce4761844 100644
--- a/gdk/gdk-private.h
+++ b/gdk/gdk-private.h
@@ -29,7 +29,7 @@ gboolean gdk_should_use_portal (void);
 
 const char *   gdk_get_startup_notification_id (void);
 
-PangoDirection gdk_unichar_direction (gunichar    ch);
+PangoDirection gdk_unichar_direction (gunichar    ch) G_GNUC_CONST;
 PangoDirection gdk_find_base_dir     (const char *text,
                                       int         len);