[gnome-alsamixer] Fix undeclared function

[Bastien Nocera <hadess src gnome org>]

commit d0c400ba34e915c441c9a402c391a37f8b00e99f
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Jun 26 14:53:03 2012 +0100

    Fix undeclared function

 src/gam-app.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/gam-app.c b/src/gam-app.c
index bb29915..31fc345 100644
--- a/src/gam-app.c
+++ b/src/gam-app.c
@@ -27,6 +27,7 @@
 #include <gtk/gtkmenuitem.h>
 #include <glib/gi18n.h>
 #include <libgnomeui/gnome-about.h>
+#include <libgnomeui/gnome-window-icon.h>
 #include <libgnomeui/gnome-app-helper.h>
 #include <libgnomeui/gnome-stock-icons.h>