[MacPorts] #68173: postgresql12: invalid value in platforms

[MacPorts]

#68173: postgresql12: invalid value in platforms
------------------------+--------------------------
 Reporter:  ryandesign  |      Owner:  dgilman
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.8.1
 Keywords:              |       Port:  postgresql12
------------------------+--------------------------
 [03fd21e13b71951734161ff0d0bcb81864f88363/macports-ports] changed
 `platforms darwin` (which is valid but redundant since it's the default
 value) to `platforms darwina` (which is invalid).

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Ticket URL: <https://trac.macports.org/ticket/68173>
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