Fix compiler errors

modules/nonfree/src/surf.ocl.cpp

@@ -43,7 +43,7 @@
 //
 //M*/
 #include "precomp.hpp"
-#include <cstring>
+#include <cstdio>
 
 #ifdef HAVE_OPENCV_OCL
 

modules/nonfree/test/test_surf.ocl.cpp

@@ -147,7 +147,7 @@ PARAM_TEST_CASE(SURF, HessianThreshold, Octaves, OctaveLayers, Extended, Upright
 TEST_P(SURF, Detector)
 {
     // the data path should be opencv/samples
-    cv::Mat image  = cv::imread(string(cvtest::TS::ptr()->get_data_path()) + "c/fruits.jpg", cv::IMREAD_GRAYSCALE);
+    cv::Mat image  = cv::imread("../../../samples/c/fruits.jpg", cv::IMREAD_GRAYSCALE);
     ASSERT_FALSE(image.empty());
 
     cv::ocl::SURF_OCL surf;
@@ -180,7 +180,7 @@ TEST_P(SURF, Detector)
 
 TEST_P(SURF, Descriptor)
 {
-    cv::Mat image  = cv::imread(string(cvtest::TS::ptr()->get_data_path()) + "c/fruits.jpg", cv::IMREAD_GRAYSCALE);
+    cv::Mat image  = cv::imread("../../../samples/c/fruits.jpg", cv::IMREAD_GRAYSCALE);
     ASSERT_FALSE(image.empty());
 
     cv::ocl::SURF_OCL surf;