Repair: incorrect display of class in DNN

* Add test that fails

* Fix integer pointPolygonTest for large coordinate values

* Review fixes:
- change type from long long to int64
- move test code to test_contours.cpp, and make it C++98 compliant

* Hopefully fix compiler error by using push_back instead of emplace_back

fixed native Lapack detection script on Mac/iOS (where native Lapack is a part of Accelerate framework)

* fixed OpenCL functions on Mac, so that the tests pass

* fixed compile warnings; temporarily disabled OCL branch of TV L1 optical flow on mac

* fixed other few warnings on macos

Observed during launch of 32/64-bit applications on Windows.
Added '32-bit' prefix for 32-bit OpenCL devices. No prefix on 64-bit configurations.

- don't write into testdata directory
- check matrices instead of result images

This reverts commit 5384a220.

'WITH_' variables is intended to enable CMake scripts with some autodetection logic.
'WITH_' can be off, but components is really enabled via command-line options
with proper variables setup (including 'HAVE_').

Python executable is not used to generate code for iOS builds

Sometimes it tries to use host '/usr/include' directory and garbages
compiler flags with invalid '-I /usr/include'