[gnome-control-center] network: Fix compile-time warning

[Bastien Nocera <hadess src gnome org>]

commit 117cf30500a7d036183387ccc9b283ae3e47a991
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Aug 13 13:43:40 2014 +0200

    network: Fix compile-time warning
    
    Missing include.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=734472

 panels/network/wireless-security/ws-wep-key.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/panels/network/wireless-security/ws-wep-key.c b/panels/network/wireless-security/ws-wep-key.c
index ffd1bd4..1cb4feb 100644
--- a/panels/network/wireless-security/ws-wep-key.c
+++ b/panels/network/wireless-security/ws-wep-key.c
@@ -27,6 +27,7 @@
 #include <nm-setting-wireless-security.h>
 
 #include "wireless-security.h"
+#include "helpers.h"
 
 struct _WirelessSecurityWEPKey {
        WirelessSecurity parent;