[MacPorts] #65570: mpich-default fails at build on Big Sur

[MacPorts]

#65570: mpich-default fails at build on Big Sur
----------------------------+--------------------
  Reporter:  mbrethen       |      Owner:  (none)
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.7.2
Resolution:                 |   Keywords:
      Port:  mpich-default  |
----------------------------+--------------------

Comment (by kencu):

 I thought this commit would fix these kinds of errors that started showing
 up:

 https://github.com/macports/macports-
 ports/commit/9712a6f0bbea20b6676bd03c4701793317b71d81

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Ticket URL: <https://trac.macports.org/ticket/65570#comment:2>
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