[MacPorts] #66346: meson @0.58.2 seems to have a flaw with "nm"

[MacPorts]

#66346: meson @0.58.2 seems to have a flaw with "nm"
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  Reporter:  ballapete  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.8.0
Resolution:             |   Keywords:  tiger ppc
      Port:  meson      |
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Comment (by ballapete):

 I found on macOS High Sierra, Version 10.13 or Darwin 17, and macOS
 Monterey, Version 12 or Darwin 21, that /usr/bin/nm understands both, BSD
 "-a" and Linux "--extern-only". Presumingly some more versions behave like
 them so that the following patch, in Attachments, can be used on Macs…

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Ticket URL: <https://trac.macports.org/ticket/66346#comment:7>
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