message: cmake: update SOVERSION
  OpenCV 4.x doesn't guarantee or maintain ABI compatibility
  We should increase SO version on each release
diff: @@ -10,8 +10,10 @@ set(OPENCV_VERSION_PLAIN "${OPENCV_VERSION_MAJOR}.${OPENCV_VERSION_MINOR}.${OPEN
  set(OPENCV_VERSION "${OPENCV_VERSION_PLAIN}${OPENCV_VERSION_STATUS}")
  -set(OPENCV_SOVERSION "${OPENCV_VERSION_MAJOR}.${OPENCV_VERSION_MINOR}")
  -set(OPENCV_LIBVERSION "${OPENCV_VERSION_MAJOR}.${OPENCV_VERSION_MINOR}.${OPENCV_VERSION_PATCH}")
  +string(REGEX MATCH "[0-9][0-9]$" OPENCV_VERSION_MINOR_2DIGITS "00${OPENCV_VERSION_MINOR}")
  +string(REGEX MATCH "[0-9][0-9]$" OPENCV_VERSION_PATCH_2DIGITS "00${OPENCV_VERSION_PATCH}")
  +ocv_update(OPENCV_SOVERSION "${OPENCV_VERSION_MAJOR}${OPENCV_VERSION_MINOR_2DIGITS}")
  +ocv_update(OPENCV_LIBVERSION "${OPENCV_VERSION_MAJOR}.${OPENCV_VERSION_MINOR}.${OPENCV_VERSION_PATCH}")
  # create a dependency on the version file
  # we never use the output of the following command but cmake will rerun automatically if the version file changes
  