[MacPorts] #62807: openmpi/mpich: prune target compiler list; refactor duplicated logic, and simplify ports, via new portgroup

[MacPorts]

#62807: openmpi/mpich: prune target compiler list; refactor duplicated logic, and
simplify ports, via new portgroup
----------------------------+----------------------
  Reporter:  mascguy        |      Owner:  mascguy
      Type:  enhancement    |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:                 |   Keywords:
      Port:  openmpi mpich  |
----------------------------+----------------------

Comment (by mascguy):

 Sadly, it looks like the subports for gcc9 and later are failing, on MacOS
 10.7 and earlier. The AVX instruction use issue is resolved, but now other
 Intel extensions are being balked at.

 It might be possible to fix this - maybe - but it's probably easier to
 simply set those to `known_fail`. Users still have options like gcc7 and
 clang90, among others, which do work with those older MacOS releases.

-- 
Ticket URL: <https://trac.macports.org/ticket/62807#comment:21>
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