[MacPorts] #61919: screen: garbled statusline in Big Sur

[MacPorts]

#61919: screen: garbled statusline in Big Sur
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  Reporter:  arjanvandervelde  |      Owner:  dgilman
      Type:  defect            |     Status:  assigned
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.6.4
Resolution:                    |   Keywords:  bigsur
      Port:  screen            |
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Comment (by arjanvandervelde):

 it looks like it's unable to figure out what to use for `GetLoadav()`.

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Ticket URL: <https://trac.macports.org/ticket/61919#comment:4>
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