message: fixed CMake warning
diff: cmake_minimum_required(VERSION 3.1)
  +# Policy: find_package() uses <PackageName>_ROOT variables
  +if(POLICY CMP0074)
  + cmake_policy(SET CMP0074 NEW)
  +endif()
  +
  set(OIDN_VERSION_MAJOR 1)
  set(OIDN_VERSION_MINOR 2)
  set(OIDN_VERSION_PATCH 0)
  