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
perf tests: added SANITY_CHECK_NOTHING()
ocl: perf test: disable MOG2 (random hungs), enable upload/download
Merge pull request #1530 from alalek:perf_tests_sanity_check_nothing
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