fixed problem with SURF loading in Python tests

modules/python/src2/cv2.cpp

@@ -18,9 +18,15 @@
 #include "opencv2/video/tracking.hpp"
 #include "opencv2/video/background_segm.hpp"
 #include "opencv2/photo/photo.hpp"
-#include "opencv2/nonfree/nonfree.hpp"
 #include "opencv2/highgui/highgui.hpp"
 
+#include "opencv2/opencv_modules.hpp"
+#ifdef HAVE_OPENCV_NONFREE
+#include "opencv2/nonfree/nonfree.hpp"
+static bool makeUseOfNonfree = cv::initModule_nonfree();
+#endif
+
+
 using cv::flann::IndexParams;
 using cv::flann::SearchParams;