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Fix HAVE_MPI undefined warnings (with -Wundef flag)

Tobias Leibner requested to merge tobias.leibner/dune-common:issue/fix_HAVE_MPI_Wundef_warning into master

I am currently testing our extension module dune-xt with the releases/2.8 branch of the core modules, and I am getting a lot of -Wundef warnings from our config.h.

I know that dune-common does not use this warning flag, but since the contents of the config.h.cmake file are included in the configs of all modules that depend on dune-common, I suggest to fix this warning to allow dependent modules to use the -Wundef flag.

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