message: Update to newerest nGraph
diff: @@ -32,7 +32,7 @@ set(CMAKE_DISABLE_IN_SOURCE_BUILD ON)
  ExternalProject_Add(
  ext_ngraph
  GIT_REPOSITORY https://github.com/NervanaSystems/ngraph
  - GIT_TAG 37fca35c8c2724ff011c30b95f52d3b53d0a9e8c
  + GIT_TAG 12e8b9b72a0bcabd157391b17175fae9c85b525a
  CMAKE_ARGS -DNGRAPH_INSTALL_PREFIX=${CMAKE_CURRENT_BINARY_DIR}/ngraph/ngraph_dist -DNGRAPH_USE_PREBUILT_LLVM=TRUE
  TMP_DIR "${CMAKE_CURRENT_BINARY_DIR}/ngraph/tmp"
  STAMP_DIR "${CMAKE_CURRENT_BINARY_DIR}/ngraph/stamp"
  