in this case the sample will not be built if OpenGL is not found

(cherry picked from commit ff002203)

Get rid of cvconfig.h in Latent SVM samples. Use common OpenCV parallel framework instead of direct TBB calls.

Add depends from highgui to imgcodecs and videoio. And include header from imgcodecs and videoio to imgcodecs

Env setup for testing package implemented using /etc/profile.d;
Variable with path for all native samples added;
Path for test binaries and test data updated.
(cherry picked from commit 39201e68)

(cherry picked from commit f332cba1)

Env setup for testing package implemented using /etc/profile.d;
Variable with path for all native samples added;
Path for test binaries and test data updated.

(cherry picked from commit b75cbfde)

Conflicts:

	cmake/OpenCVModule.cmake

HAVE_opencv_ocl implies HAVE_OPENCL, so checking for both is not
necessary.

Allow to build samples via OpenCV binaries from distribution package
(find_package with OpenCV_DIR).