[MacPorts] #48168: openmpi Update to 1.8.6

[MacPorts]

#48168: openmpi Update to 1.8.6
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 Reporter:  hans.ekkehard.plesser@…  |      Owner:  macports-tickets@…
     Type:  update                   |     Status:  new
 Priority:  Normal                   |  Milestone:
Component:  ports                    |    Version:  2.3.3
 Keywords:                           |       Port:  openmpi
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 The attached patch

  - updates openmpi to version 1.8.6
  - adds 5.1 to the list of gcc versions

 It is my first attempt at updating a portfile, I hope it will be useful.

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Ticket URL: <https://trac.macports.org/ticket/48168>
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