message: Automatically set the correct OpenCV version in build.gradle
  Automatically sets the correct OpenCV version in the CMAKE example contained in the build.gradle
  file of the Android SDK.
diff: //
  // - Use find_package() in app/CMakeLists.txt:
  //
  -// find_package(OpenCV 3.4 REQUIRED java)
  +// find_package(OpenCV @OPENCV_VERSION_MAJOR@.@OPENCV_VERSION_MINOR@ REQUIRED java)
  // ...
  // target_link_libraries(native-lib ${OpenCV_LIBRARIES})
  //
  