If device does not support double, returns immediately.
Double floating points are not default supported by OpenCL.
fixed ocl::minMax
fixed ocl::countNonZero
Make libv4l support optional for testing purposes.
fixed ocl::sum, ocl::sqrSum, ocl::absSum
fixed ocl::phase
fixed ocl::setIdentity
fixed ocl::meanStddev and created accuracy test for this function
perf test: update error message about relative error
fixed and extended ocl::norm
removed test_norm.cpp from ocl tests
Merge pull request #1525 from asmorkalov:ocv_custom_libv4l
Merge pull request #1519 from ilya-lavrenov:ocl_minMax
Merge pull request #1533 from alalek:perf_test_update_relative_error_message
Updated Google Test to 1.7.0.
fixed ocl::bitwise_not in case of CV_8UC1, CV_8UC2
Merge pull request #1547 from SpecLad:gtest-1.7
enabled ocl::norm perf test
ocl: dynamic load of OpenCL libraries

Support functions from OpenCL 1.1 / OpenCL 1.2
ocl: cl_runtime: added autogenerated code