[MacPorts] #62878: openmpi: fix builds for MacOS 10.8 and earlier, by disabling use of AVX instruction set; mark known_fail, for cases not easily fixable

[MacPorts]

#62878: openmpi: fix builds for MacOS 10.8 and earlier, by disabling use of AVX
instruction set; mark known_fail, for cases not easily fixable
----------------------+----------------------
  Reporter:  jmroot   |      Owner:  mascguy
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  openmpi  |
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Comment (by kencu):

 As an aside, almost 100% of users on systems < 10.9 have clang-9.0
 installed,

 So most anyone who actually tried to build openmpi-gcc10 before it was
 blocked from their systems actually succeeded.

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Ticket URL: <https://trac.macports.org/ticket/62878#comment:10>
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