Bug#865526: PETSc has strict dependency on MPI version

[Drew Parsons]

reopen 865526
retitle 865526 PETSc has strict dependency on MPI version
severity 865526 normal
forwarded 865526 https://bitbucket.org/petsc/petsc/commits/ca70f86ee9db8e69523e0e69f12289c6cab9b4cb?at=jed/mpi-semver
thanks

Reopening to help track upstream handling of PETSc's MPI dependency
logic.

Until that's fixed, we need to lodge a binNMU for PETSc every time
openmpi (or mpich on m68k, sh4) is updated to a new upstream version.

Drew