[gtk+] Fix compilation warning: Use G_ENABLE_DEBUG to enable the var

[Javier Jardón <jjardon src gnome org>]

commit 3e5d49f52bacab047e7a36bb5329f84ba6c5fd1a
Author: Javier Jardón <jjardon gnome org>
Date:   Mon Apr 12 20:43:18 2010 +0200

    Fix compilation warning: Use G_ENABLE_DEBUG to enable the var

 gtk/gtktrayicon-x11.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtktrayicon-x11.c b/gtk/gtktrayicon-x11.c
index 49fd86a..8e7f7cb 100644
--- a/gtk/gtktrayicon-x11.c
+++ b/gtk/gtktrayicon-x11.c
@@ -545,7 +545,9 @@ static gboolean
 gtk_tray_icon_delete (GtkWidget   *widget,
 		      GdkEventAny *event)
 {
+#ifdef G_ENABLE_DEBUG
   GtkTrayIcon *icon = GTK_TRAY_ICON (widget);
+#endif
 
   GTK_NOTE (PLUGSOCKET,
 	    g_print ("GtkStatusIcon %p: delete notify, tray manager window %lx\n",