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Handle optional dependency MPI by directly passing HAVE_MPI flag

Simon Praetorius requested to merge feature/have-mpi into master

Summary

This MR changes the way optional dependencies are enabled in cmake, following the MR !1294 (merged). Essentially the add_dune_xy_flags function and the dune_register_package_flags now sets HAVE_XY directly instead of writing a config.h entry and setting ENABLE_XY afterwards.

In this MR the package flags for MPI are updated.

Edited by Christoph Grüninger

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