Bug: I_MPI_VERSION vanished into 2019 release and different than MPI_Get_library_version

Hi,

I just noticed that the mpi.h file included with 2019 release is missing any #define that helps to detect the mpi flavor used like former I_MPI_VERSION #define.

The wrong thing is that, when calling the MPI_Get_library_version function, the output is:

Intel(R) MPI Library 2019 for Linux* OS

which I think, should be something like:

MPICH Version: 3.3b2

or close to...

I suggest two ways to fix this:

- Modify MPI_Get_library_version to return the mpich version string...

- Re-add the I_MPI_VERSION or any #define, to detect at compile-time that "Intel MPI" is used.

Thanks,

Eric

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