[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):

 Base has already been updated to handle this

 https://github.com/macports/macports-
 base/commit/8aa347e8adaa0250fda0b45309d3a31266c7cedb

 Of course thats just in the master branch, so not yet in a public release.

 Personally, i think there is some merit to considering using by default
 the versionless sdk on big sur and newer.

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Ticket URL: <https://trac.macports.org/ticket/61866#comment:6>
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