Bug#833425: mpi-defaults: switch to openmpi on hppa architecture

[Helge Deller]

Package: mpi-defaults
Version: 1.6

mpi-defaults depends on libmpich-dev for the hppa architecture (like m68k and sh4).
All other architectures use libopenmpi-dev.
Is there a reason for that?
The openmpi packages builds successfully on hppa, so I'd suggest to switch
to openmpi for hppa (and maybe m68k and sh4?) too.

The reason for this request is, that I'm seeing quite some mpi issues when
building other packages, e.g. boost-1.6.1 (https://buildd.debian.org/status/fetch.php?pkg=boost1.61&arch=hppa&ver=1.61.0%2Bdfsg-2.1&stamp=1470277857)
which I hope to get fixed if we switch to openmpi on hppa.

Thanks,
Helge