Add missing <sstream> includes

apps/visualisation/opencv_visualisation.cpp

@@ -60,6 +60,7 @@ Created by: Puttemans Steven - April 2016
 
 #include <fstream>
 #include <iostream>
+#include <sstream>
 
 using namespace std;
 using namespace cv;

modules/core/include/opencv2/core/opencl/opencl_info.hpp

@@ -3,6 +3,7 @@
 // of this distribution and at http://opencv.org/license.html.
 
 #include <iostream>
+#include <sstream>
 
 #include <opencv2/core.hpp>
 #include <opencv2/core/ocl.hpp>

modules/core/src/check.cpp

@@ -4,6 +4,8 @@
 
 #include "precomp.hpp"
 
+#include <sstream>
+
 #include "opencv2/core/check.hpp"
 
 namespace cv {