[MacPorts] #49720: alps: fix mpi variants

[MacPorts]

#49720: alps: fix mpi variants
------------------------+-----------------------
 Reporter:  dstrubbe@…  |      Owner:  gamperl@…
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.3.4
 Keywords:  haspatch    |       Port:  alps
------------------------+-----------------------
 The openmpi variant for alps did nothing: a dependency was added and MPI
 was requested, but the appropriate configuration variables for the
 compilers were not set, so MPI was not found and used. Now MPI variants
 are supported through the mpi portgroup, and consistency for HDF5 is
 checked. clang will not be used since it does not work for MPI or
 +applications in this code. gcc is set as default compiler. openmaintainer
 is added, as per the guide: "Port maintainers who are not committers are
 encouraged to add <openmaintainer> to their ports."

-- 
Ticket URL: <https://trac.macports.org/ticket/49720>
MacPorts <https://www.macports.org/>
Ports system for OS X