[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
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  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 jmroot):

 The -config binaries not being present shouldn't be a problem though, the
 error indicates that libSystem can't be found, which should just require
 `MacOSX11.0.sdk/usr/lib/libSystem.tbd`.

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Ticket URL: <https://trac.macports.org/ticket/61849#comment:5>
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