erne: new package starting at 2.1.1 (#9676)
erne: new package starting at 2.1.1 (#9676)

* erne: new package starting at 2.1.1

* erne: remove unused configure args

* erne: remove unused prefix arg

* erne: add explicit mpi disable

LLNL/spack,LLNL/spack,iulian787/spack,LLNL/spack,LLNL/spack,iulian787/spack,iulian787/spack,iulian787/spack,iulian787/spack,LLNL/spack