[MacPorts] #62158: py-protobuf3: install failures for macOS 10.8 through 10.11: compilation error related to PROTOBUF_MAYBE_CONSTEXPR MapFieldBase(ConstantInitialized)

[MacPorts]

#62158: py-protobuf3: install failures for macOS 10.8 through 10.11: compilation
error related to PROTOBUF_MAYBE_CONSTEXPR MapFieldBase(ConstantInitialized)
---------------------------+-------------------------
  Reporter:  mascguy       |      Owner:  Schamschula
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  py-protobuf3  |
---------------------------+-------------------------

Comment (by Schamschula):

 I just think this is a bad idea to ask anyone revbumping dependent ports
 to check if they build on 11 macOS versions (12 counting arm64 Big Sur),
 and fix everything while they're at it.

 I'm thinking of updates to ghostscript, for example. Things are often
 broken before the revbump.

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Ticket URL: <https://trac.macports.org/ticket/62158#comment:11>
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