remove redundant OPENCL_DIR flag

remove as much warnings as possible
use enum instead of MACRO for ocl.hpp
add command line parser in accuracy test and perf test
some bug fix for arthim functions

modules/ocl/perf/perf_split_merge.cpp

@@ -450,7 +450,7 @@ TEST_P(Split, Accuracy)
     for(int j = LOOPROISTART; j < LOOPROIEND; j ++)
     {
         Has_roi(j);
-        cv::Mat         dev_dst[4]  = {dst1_roi, dst2_roi, dst3_roi, dst4_roi};
+        //cv::Mat         dev_dst[4]  = {dst1_roi, dst2_roi, dst3_roi, dst4_roi};
         cv::ocl::oclMat dev_gdst[4] = {gdst1, gdst2, gdst3, gdst4};
         gdst1_whole = dst1;
         gdst1 = gdst1_whole(Rect(dst1x, dst1y, roicols, roirows));