Disable ParMetis support in the examples
ParMetis does something weird with the mpi.h header and C linkage. This leads to "conflicting declaration" errors for MPI methods. As we are not using ParMetis anyway let's just disable it. Yes, this is not particularly pretty, but the problem will go away once we port away from dune-pdelab, which we plan on doing anyway.
import-examples in 25 minutes and 31 seconds (queued for 2 seconds)10 jobs for