[MacPorts] #48583: screen: update to 4.3.1

[MacPorts]

#48583: screen: update to 4.3.1
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 Reporter:  youvegotmoxie@…  |      Owner:  macports-tickets@…
     Type:  update           |     Status:  new
 Priority:  Normal           |  Milestone:
Component:  ports            |    Version:  2.3.3
 Keywords:  haspatch         |       Port:  screen
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 sysutils/screen is over 1 year out of date and is set to nomaintainer, I
 would like to maintain the port.

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Ticket URL: <https://trac.macports.org/ticket/48583>
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