[Fortran][Test needed] Inconsistency with op in MPI_Ireduce_fortran_wrapper

[AlexisLaplanche]

Inconsistency when using op in MPI_Ireduce_fortran_wrapper:

interpol/src/interpol-f.c

Line 871 in 4247734

_wrap_py_return_val = PMPI_Ireduce((const void*)sendbuf, (void*)recvbuf, *count, (MPI_Datatype)(*datatype), (MPI_Op)(*op), *root, (MPI_Comm)(*comm), (MPI_Request*)request);

(MPI_Op)(*op) for MPICH, it should work as intended

interpol/src/interpol-f.c

Line 875 in 4247734

_wrap_py_return_val = PMPI_Ireduce((const void*)sendbuf, (void*)recvbuf, *count, MPI_Type_f2c(*datatype), MPI_Op_f2c(*op), *root, MPI_Comm_f2c(*comm), &temp_request);

MPI_Op_f2c(*op) for OpenMPI, it should work as intended

interpol/src/interpol-f.c

Line 885 in 4247734

if ((MPI_Op)op == MPI_MAX) {

(MPI_Op)op , this should not work with both MPICH and OpenMPI