[MacPorts] #48091: openmpi @1.7.5_4: update subports — add gcc5, gcc6, clang36, clang37; remove clang31, clang32

[MacPorts]

#48091: openmpi @1.7.5_4: update subports — add gcc5, gcc6, clang36, clang37;
remove clang31, clang32
-------------------------+---------------------
 Reporter:  larryv@…     |      Owner:  sean@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  haspatch     |       Port:  openmpi
-------------------------+---------------------
 The attached patch updates the `openmpi` lineup for our current set of
 supported compilers.

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Ticket URL: <https://trac.macports.org/ticket/48091>
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