[MacPorts] #61866: base uses incorrect SDK for Big Sur 11.1 and Xcode 12.3

[MacPorts]

#61866: base uses incorrect SDK for Big Sur 11.1 and Xcode 12.3
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  Reporter:  mf2k    |      Owner:  jmroot
      Type:  defect  |     Status:  closed
  Priority:  Normal  |  Milestone:  MacPorts 2.7.0
 Component:  base    |    Version:  2.6.99
Resolution:  fixed   |   Keywords:
      Port:          |
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Changes (by jmroot):

 * milestone:   => MacPorts 2.7.0


Comment:

 As no data has been forthcoming, I made my best guess as to what would
 distinguish a broken partial SDK from a complete one.

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Ticket URL: <https://trac.macports.org/ticket/61866#comment:23>
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