[gtk+] Drop the last use of GDK_MULTIHEAD_SAFE

[Matthias Clasen <matthiasc src gnome org>]

commit 12837f690562225d53182bc258043b4f068b345f
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Nov 10 16:14:19 2017 -0500

    Drop the last use of GDK_MULTIHEAD_SAFE
    
    This define is not used anymore, this was a leftover.

 gtk/gtkicontheme.h |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkicontheme.h b/gtk/gtkicontheme.h
index 87cdcf5..b9447ba 100644
--- a/gtk/gtkicontheme.h
+++ b/gtk/gtkicontheme.h
@@ -345,12 +345,10 @@ GdkPixbuf *           gtk_icon_info_load_symbolic_for_context_finish (GtkIconInf
                                                                      gboolean         *was_symbolic,
                                                                      GError          **error);
 
-#ifndef GDK_MULTIHEAD_SAFE
 GDK_AVAILABLE_IN_ALL
 gboolean gtk_icon_size_lookup (GtkIconSize  size,
                                gint        *width,
                                gint        *height);
-#endif /* GDK_MULTIHEAD_SAFE */
 
 
 G_END_DECLS