[MacPorts] #42330: meld: update to 1.8.4

[MacPorts]

#42330: meld: update to 1.8.4
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 Reporter:  noah.treuhaft@…  |      Owner:  macports-tickets@…
     Type:  update           |     Status:  new
 Priority:  Normal           |  Milestone:
Component:  ports            |    Version:  2.2.1
 Keywords:  haspatch         |       Port:  meld
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 Portfile patch attached.

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Ticket URL: <https://trac.macports.org/ticket/42330>
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