[LyX/master] Make layout test compile

[Georg Baum]

commit 53f8d6d6d373460bdcfebd20d6f826e3915c84ff
Author: Georg Baum <b...@lyx.org>
Date:   Thu May 29 15:07:07 2014 +0200

    Make layout test compile

diff --git a/src/tests/dummy_functions.cpp b/src/tests/dummy_functions.cpp
index 5a99081..ce4261c 100644
--- a/src/tests/dummy_functions.cpp
+++ b/src/tests/dummy_functions.cpp
@@ -1,6 +1,6 @@
 #include <config.h>
 
-#include "../Messages.h"
+#include "../support/Messages.h"
 
 using namespace std;