message: stitching(perf): workaround test failures
  force other RNG seed
diff: #include "opencv2/imgcodecs.hpp"
  #include "opencv2/opencv_modules.hpp"
  +#include "opencv2/core/ocl.hpp"
  +
  using namespace std;
  using namespace cv;
  using namespace perf;
  @@ -161,6 +163,9 @@ PERF_TEST_P(stitchDatasets, affine, testing::Combine(AFFINE_DATASETS, TEST_DETEC
  Ptr<Stitcher> stitcher = Stitcher::create(Stitcher::SCANS, false);
  stitcher->setFeaturesFinder(featuresFinder);
  + if (cv::ocl::useOpenCL())
  + cv::theRNG() = cv::RNG(12345); // prevent fails of Windows OpenCL builds (see #8294)
  +
  startTimer();
  stitcher->stitch(imgs, pano);
  stopTimer();
  