[MacPorts] #70600: poppler requires C++20 which is not available on 10.4–10.5

[MacPorts]

#70600: poppler requires C++20 which is not available on 10.4–10.5
----------------------------+---------------------
 Reporter:  barracuda156    |      Owner:  (none)
     Type:  defect          |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  ports           |    Version:  2.10.1
 Keywords:  tiger, leopard  |       Port:  poppler
----------------------------+---------------------
 It has been reported that poppler fails to install on Leopard. Lo and
 behold, it asks for C++20 (!):
 {{{
 :info:configure   Target "cmTC_a3da4" requires the language dialect
 "CXX20" .  But the
 :info:configure   current compiler "GNU" does not support this, or CMake
 does not know the
 :info:configure   flags to enable it.
 }}}

 Since nobody seems interested to merge my fix allowing to use modern gcc
 on < 10.6, perhaps at least add a fallback, so that people can build ports
 which use poppler?

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Ticket URL: <https://trac.macports.org/ticket/70600>
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