[ekiga] Added missing include.

[Damien Sandras <dsandras src gnome org>]

commit ae8d7fbe69fe9d91bd1dabe9eb0b77e576e1e2e2
Author: Damien Sandras <dsandras beip be>
Date:   Sun Apr 15 16:20:01 2012 +0200

    Added missing include.

 lib/engine/notification/notification-core.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/lib/engine/notification/notification-core.h b/lib/engine/notification/notification-core.h
index 2b09b87..162168c 100644
--- a/lib/engine/notification/notification-core.h
+++ b/lib/engine/notification/notification-core.h
@@ -36,6 +36,8 @@
 #ifndef __NOTIFICATION_CORE_H__
 #define __NOTIFICATION_CORE_H__
 
+#include "services.h"
+
 #include <boost/smart_ptr.hpp>
 
 namespace Ekiga