added perf tests for min, max, abs
fixed kernel compilation warnings on MacOSX
ocl: fix build on Mac
enabled accuracy tests for the functions that use inside AMD Blas/Fft
Merge pull request #1594 from ilya-lavrenov:ocl_perf
Merge pull request #1598 from alalek:ocl_fix_build_mac
ocl: code cleanup, fix .clb files
Merge pull request #1595 from alalek:cl_code_cleanup
Merge pull request #1599 from ilya-lavrenov:ocl_mac_kernel_warnings
fixed ocl optical flow: sparse and tvl1
Merge pull request #1601 from ilya-lavrenov:ocl_fix_tvl1_and_sparse