[MacPorts] #61839: cmake: Configure failure with MacOS 11.1 and Xcode 12.3

[MacPorts]

#61839: cmake: Configure failure with MacOS 11.1 and Xcode 12.3
---------------------+-----------------------
  Reporter:  mf2k    |      Owner:  michaelld
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.99
Resolution:          |   Keywords:
      Port:  cmake   |
---------------------+-----------------------

Comment (by michaelld):

 I’ll note that in the cmake log I see
 `isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk` which I
 do not think should be there with Xcode 12. When you updated Xcode did you
 `sudo rm -rf ` the folder `/Library/Developer/` or at least the Xcode
 installed contents inside it? Guessing that’s the issue here.

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Ticket URL: <https://trac.macports.org/ticket/61839#comment:2>
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