Fix android tutorial 3 second picture taken bug
NullPointerException in case of error on opening native camera fixed.
fixing precommit build on ubuntu-64 (now it takes OCL headers from non-default OCL SDK, but libs from default one)
Merge pull request #858 from apavlenko:fix_ocl_build_on_bb
Merge pull request #854 from asmorkalov:android_null_invalid_cam
Fix tuto3 picture taken crash on all devices
A modification of the JavaCameraView is needed to avoid a crash when the
app is exited. It is a good practice to remove the callback after the
stopPreview method.
Add OpenCL version 1.2 query into ocl::Context::supportsFeature().
Add backwards portability for OpenCL 1.1 when OpenCV executables
are compiled with OpenCL 1.2 profile support.
ocl: Enable backward binary portability for setTo function.
 add (optional) index argument to RetrieveFrame method
Suppress warning when compiling deprecated OpenCL function on GNU compilers.
Link to bug tracker replaced by bug description
Merge pull request #846 from smart-mobile-software:tuto_crash
Merge pull request #865 from pengx17:2.4_ocl_ver
Merge pull request #866 from MadEgg:RetrieveFrame_index_argument