[gtk/property-selection: 1/3] Drop an unnecessary include

[Matthias Clasen <matthiasc src gnome org>]

commit c3a6e3507023719588555a4bec024765bfd52aeb
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Jun 6 09:39:36 2020 -0400

    Drop an unnecessary include

 gtk/gtkmultiselection.c | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/gtk/gtkmultiselection.c b/gtk/gtkmultiselection.c
index 73bcee6daa..a97718e704 100644
--- a/gtk/gtkmultiselection.c
+++ b/gtk/gtkmultiselection.c
@@ -23,7 +23,6 @@
 
 #include "gtkintl.h"
 #include "gtkselectionmodel.h"
-#include "gtksingleselection.h"
 #include "gtkset.h"
 
 /**