[MacPorts] #61849: gobject-introspection: Configure failure on Big Sur 11.1 and Xcode 12.3

[MacPorts]

#61849: gobject-introspection: Configure failure on Big Sur 11.1 and Xcode 12.3
------------------------------------+----------------------
  Reporter:  mf2k                   |      Owner:  dbevans
      Type:  defect                 |     Status:  assigned
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:
Resolution:                         |   Keywords:
      Port:  gobject-introspection  |
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Comment (by mf2k):

 Yes, something is clearly wrong with my 11.0 setup then.

 {{{
 $ ls -al
 /Library/Developer/CommandLineTools/SDKs/MacOSX11.1.sdk/usr/lib/libSystem.tbd
 lrwxr-xr-x  1 root  wheel  15 Dec 14 13:40
 /Library/Developer/CommandLineTools/SDKs/MacOSX11.1.sdk/usr/lib/libSystem.tbd
 -> libSystem.B.tbd

 $ ls -al
 /Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk/usr/lib/libSystem.tbd
 ls:
 /Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk/usr/lib/libSystem.tbd:
 No such file or directory
 }}}

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Ticket URL: <https://trac.macports.org/ticket/61849#comment:6>
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