Bug#702438: xmpi: Another case of missing quoting in m4 files

[Michael Tautschnig]

Control: reopen -1

Thanks a lot for fixing the problem reported earlier, but I'm afraid there's one
more such case of missing quotes: config/mpi_check_mpi_h.m4 should be fixed in
the same way as the other two .m4 files.

Thanks a lot,
Michael

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