[MacPorts] #70481: curl @8.9.1: again pulls in a dependency on a newer gcc compiler, which makes bootstrapping problematic

[MacPorts]

#70481: curl @8.9.1: again pulls in a dependency on a newer gcc compiler, which
makes bootstrapping problematic
----------------------------+------------------------
  Reporter:  barracuda156   |      Owner:  ryandesign
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.9.3
Resolution:                 |   Keywords:  powerpc
      Port:  curl, nghttp2  |
----------------------------+------------------------

Comment (by barracuda156):

 Maybe make a `+bootstrap` variant for a minimal `curl`? And by default
 enable whatever desirable. I have no issues with C++20, I just want an
 option to bootstrap `curl` when needed without bells and whistles
 requiring me to waste 8 hours of compilation time (on a G4 it will be 24+
 hours, perhaps).

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Ticket URL: <https://trac.macports.org/ticket/70481#comment:4>
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