Fix binary compatibility of opencv_objdetect

modules/objdetect/include/opencv2/objdetect/objdetect.hpp

@@ -597,13 +597,13 @@ public:
 
 
    // evaluate specified ROI and return confidence value for each location
-   virtual void detectROI(const cv::Mat& img, const vector<cv::Point> &locations,
+   void detectROI(const cv::Mat& img, const vector<cv::Point> &locations,
                                    CV_OUT std::vector<cv::Point>& foundLocations, CV_OUT std::vector<double>& confidences,
                                    double hitThreshold = 0, cv::Size winStride = Size(),
                                    cv::Size padding = Size()) const;
 
    // evaluate specified ROI and return confidence value for each location in multiple scales
-   virtual void detectMultiScaleROI(const cv::Mat& img,
+   void detectMultiScaleROI(const cv::Mat& img,
                                                        CV_OUT std::vector<cv::Rect>& foundLocations,
                                                        std::vector<DetectionROI>& locations,
                                                        double hitThreshold = 0,