message: wrap policy for compat with older cmake
diff: @@ -6,8 +6,9 @@ set(USE_LMDB 0)
  set(USE_LEVELDB 0)
  set(USE_OPENCV 0)
  +if(POLICY CMP0104)
  cmake_policy(SET CMP0104 OLD) #TODO: clean up Cuda.cmake to be modern to avoid this workaround
  -
  +endif()
  set(CMAKE_CXX_STANDARD 14)
  set(CMAKE_CUDA_STANDARD 14)
  