[MacPorts] #62878: openmpi: fix builds for MacOS 10.8 and earlier; mark known_fail, for cases not easily fixable

[MacPorts]

#62878: openmpi: fix builds for MacOS 10.8 and earlier; mark known_fail, for cases
not easily fixable
----------------------+---------------------
  Reporter:  jmroot   |      Owner:  mascguy
      Type:  defect   |     Status:  closed
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:  fixed    |   Keywords:
      Port:  openmpi  |
----------------------+---------------------

Comment (by mascguy):

 The aforementioned fixed are present in the following two commits:

 https://github.com/macports/macports-
 ports/commit/883e402ae5c48131366196332fc874ed0a26ecb2

 https://github.com/macports/macports-
 ports/commit/3c28142a5299c165c1a38a60a819bd82229d0c67

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Ticket URL: <https://trac.macports.org/ticket/62878#comment:24>
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