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/gemm.cpp

@@ -50,11 +50,18 @@
 
 #include "clAmdBlas.h"
 
-#if !defined (HAVE_OPENCL)
-void cv::ocl::dft(const oclMat &src, oclMat &dst, int flags)
+#if !defined HAVE_OPENCL
+void cv::ocl::gemm(const oclMat &src1, const oclMat &src2, double alpha,
+                   const oclMat &src3, double beta, oclMat &dst, int flags)
 {
     throw_nogpu();
 }
+#elif !defined HAVE_CLAMDBLAS
+void cv::ocl::gemm(const oclMat &src1, const oclMat &src2, double alpha,
+                   const oclMat &src3, double beta, oclMat &dst, int flags)
+{
+    CV_Error(CV_StsNotImplemented, "OpenCL BLAS is not implemented");
+}
 #else
 
 using namespace cv;