[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:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  base    |    Version:  2.6.99
Resolution:          |   Keywords:
      Port:          |
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Comment (by cjones051073):

 Replying to [comment:9 mf2k]:
 > I can manually delete the 11.0 SDK. But needing to do so is not
 documented anywhere. Not by Apple or Macports.

 When I updated to 11.1 and Xcode 12.3 + corresponding CLT, the 11.0 SDK
 was removed, and the 11.1 installed. I think its a bit odd this didnt
 happen for you as well.

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Ticket URL: <https://trac.macports.org/ticket/61866#comment:15>
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