[gtk/master.msvc: 2436/2436] demos/gtk-demo/listview*.c: Include stdlib.h

[Chun-wei Fan <fanchunwei src gnome org>]

commit 8eae6c91ba815d37cf5adffd89fffb6f1f73f1cc
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Thu Jun 4 16:35:02 2020 +0800

    demos/gtk-demo/listview*.c: Include stdlib.h
    
    atoi() and qsort() both require this header for them to be defined

 demos/gtk-demo/listview_colors.c   | 2 ++
 demos/gtk-demo/listview_settings.c | 2 ++
 2 files changed, 4 insertions(+)
---
diff --git a/demos/gtk-demo/listview_colors.c b/demos/gtk-demo/listview_colors.c
index c67f4ee4e8..7e3a10a7bd 100644
--- a/demos/gtk-demo/listview_colors.c
+++ b/demos/gtk-demo/listview_colors.c
@@ -11,6 +11,8 @@
 
 #include <gtk/gtk.h>
 
+#include <stdlib.h>
+
 #define GTK_TYPE_COLOR (gtk_color_get_type ())
 G_DECLARE_FINAL_TYPE (GtkColor, gtk_color, GTK, COLOR, GObject)
 
diff --git a/demos/gtk-demo/listview_settings.c b/demos/gtk-demo/listview_settings.c
index 5fcd2d08fa..589b1ccbb5 100644
--- a/demos/gtk-demo/listview_settings.c
+++ b/demos/gtk-demo/listview_settings.c
@@ -9,6 +9,8 @@
 
 #include <gtk/gtk.h>
 
+#include <stdlib.h>
+
 /* Create an object that wraps GSettingsSchemaKey because that's a boxed type */
 typedef struct _SettingsKey SettingsKey;
 struct _SettingsKey