[MacPorts] #44335: taglib @1.9.1 with macosx_deployment_target set fails to configure

[MacPorts]

#44335: taglib @1.9.1 with macosx_deployment_target set fails to configure
---------------------+--------------------------------
  Reporter:  help@…  |      Owner:  macports-tickets@…
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.3.1
Resolution:          |   Keywords:
      Port:  taglib  |
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Comment (by ryandesign@…):

 I would expect this to happen with any port that uses the cmake portgroup,
 not just taglib.

 The obvious solution would be to not set `macosx_deployment_target` in
 macports.conf. The option is undocumented because it is unsupported.

 The SDK in MacPorts has historically been set based on the deployment
 target, though this is wrong; they should be decoupled. In r115429 a
 separate option `macosx_sdk_version` was added but the cmake portgroup has
 not yet been updated to use this. However, since that change was released
 to the public in MacPorts 2.3.0, we should modify the cmake portgroup to
 use it.

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Ticket URL: <https://trac.macports.org/ticket/44335#comment:1>
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