[MacPorts] #68038: pg meson: add formal support for 'buildtype'; potentially support adding variant 'debug'

[MacPorts]

#68038: pg meson: add formal support for 'buildtype'; potentially support adding
variant 'debug'
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  Reporter:  mascguy      |      Owner:  mascguy
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.8.1
Resolution:               |   Keywords:  portgroup
      Port:  pg-meson     |
--------------------------+-----------------------

Comment (by lukaso):

 Thanks. Since I have a few shadow ports in my repo, would be great to know
 how to do this there when the time is right.

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Ticket URL: <https://trac.macports.org/ticket/68038#comment:2>
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