fix build with CMake

now it builds by the command:
`cmake.exe -Wno-dev -GNinja -DCMAKE_MAKE_PROGRAM="path\to\ninja\ninja.exe" -DCMAKE_TOOLCHAIN_FILE=../opencv3/platforms/android/android.toolchain.cmake -DANDROID_ABI="armeabi-v7a with NEON" -DANDROID_SDK_TARGET=21 -DANDROID_NATIVE_API_LEVEL=14 -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON -DBUILD_ANDROID_EXAMPLES=ON -DINSTALL_ANDROID_EXAMPLES=ON -DWITH_OPENCL=YES -DANDROID_OPENCL_SDK=path\to\OpenCL ../opencv`

samples/android/tutorial-4-opencl/CMakeLists.txt

@@ -15,11 +15,12 @@ else()
 endif()
 
 include_directories(${ANDROID_OPENCL_SDK}/include)
-link_directories(${ANDROID_OPENCL_SDK}/lib/${ANDROID_ABI})
+link_directories(${ANDROID_OPENCL_SDK}/lib/${ANDROID_NDK_ABI_NAME})
 add_android_project(${sample} "${CMAKE_CURRENT_SOURCE_DIR}"
     LIBRARY_DEPS ${OpenCV_BINARY_DIR}
     SDK_TARGET 21 ${ANDROID_SDK_TARGET}
     NATIVE_DEPS ${native_deps} -lGLESv2 -lEGL -lOpenCL
+    COPY_LIBS YES
 )
 if(TARGET ${sample})
   add_dependencies(opencv_android_examples ${sample})