4.x
Build warning fix in Tutorial4-OpenCL.
Merge pull request #24715 from AleksandrPanov:update_android_opencl_sample
Refreshed OpenCL sample for Android.
Removed Android AIDL from build scrips and tutorials as it's not needed since 4.9.0.
Camera and Camera2 preview is rendered via OpenGL textures and can be modified on CPU via C++ code. No OpenCL yet.