[MacPorts] #40417: arpack @3.1.3: remove openmpi from default variants

[MacPorts]

#40417: arpack @3.1.3: remove openmpi from default variants
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  Reporter:  takeshi@…  |      Owner:  mmoll@…
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.2.0
Resolution:             |   Keywords:
      Port:  arpack     |
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Comment (by egall@…):

 Arpack's `+openmpi` default variant is also impeding my progress on my
 work on a port for Scilab (#29595). Currently I'm just taking the easy
 route and just disabling arpack support, but I'd probably be able to more
 easily add arpack support if the arpack port didn't have `+openmpi` as a
 default variant.

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Ticket URL: <https://trac.macports.org/ticket/40417#comment:2>
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