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FindMPI: Treat 'command not found' as an error

Christian Pfeiffer requested to merge ChrisTX/cmake:fmpi-command-not-found into master

If the compiler given in I_MPI_... could not be found, the Intel MPI wrappers emit an error like "line 590: ifort: command not found". The script should currently fail to match the output of this for information, but we should generally treat such an output as invalid, since the displayed configuration line can become a mixup between Intel and GNU compiler settings.

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