[LyX/master] fix make check.

[Pavel Sanda]

commit d13048c7f547c715d39f52e493521f1f5726fb70
Author: Pavel Sanda <sa...@lyx.org>
Date:   Mon Jul 4 14:10:30 2016 -0700

    fix make check.
---
 src/tests/check_layout.cpp |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/src/tests/check_layout.cpp b/src/tests/check_layout.cpp
index 318ae48..8e2bb6c 100644
--- a/src/tests/check_layout.cpp
+++ b/src/tests/check_layout.cpp
@@ -11,7 +11,10 @@
 #include "../support/Package.h"
 
 #include <cstdlib>
+#include <fstream>
 #include <iostream>
+#include <sstream>
+using namespace std;
 
 
 namespace lyx {