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/src/fft.cpp

@@ -51,13 +51,17 @@ using namespace cv;
 using namespace cv::ocl;
 using namespace std;
 
-#if !defined (HAVE_OPENCL)
+#if !defined HAVE_OPENCL
 void cv::ocl::dft(const oclMat &src, oclMat &dst, int flags)
 {
     throw_nogpu();
 }
+#elif !defined HAVE_CLAMDFFT
+void cv::ocl::dft(const oclMat &src, oclMat &dst, int flags)
+{
+    CV_Error(CV_StsNotImplemented, "OpenCL DFT is not implemented");
+}
 #else
-
 #include <clAmdFft.h>
 
 namespace cv