[MacPorts] #62770: clang++ 11 broken by MacOS 11.3 update

[MacPorts]

#62770: clang++ 11 broken by MacOS 11.3 update
-----------------------+---------------------------
  Reporter:  haberg-1  |      Owner:  jeremyhu
      Type:  defect    |     Status:  closed
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.4
Resolution:  fixed     |   Keywords:  bigsur x86_64
      Port:  clang-11  |
-----------------------+---------------------------

Comment (by kencu):

 We should sort out if backporting this further to earlier clangs is needed
 or makes sense.

 I guess it probably does, as this is behaviour that was broken forever,
 even though it didn't show up until some recent change in the libc++
 headers made it obvious.

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Ticket URL: <https://trac.macports.org/ticket/62770#comment:20>
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