message: Bugfix for using-with-cmake example and newer versions of CMake
  CMake creates the `MPI::MPI_CXX` target, but conduit expects the `mpi` target.
  As a stopgap, create the `mpi` target as an alias to `MPI::MPI_CXX` when `mpi is not a target.
diff: @@ -56,6 +56,10 @@ endif()
  # Required to create Conduit's MPI dependencies
  if (ENABLE_MPI)
  find_package(MPI REQUIRED)
  +
  + if(NOT TARGET mpi AND TARGET MPI::MPI_CXX)
  + add_library(mpi ALIAS MPI::MPI_CXX)
  + endif()
  endif()
  find_package(axom REQUIRED
  