[MacPorts] #50590: udunits2: update to 2.2.20

[MacPorts]

#50590: udunits2: update to 2.2.20
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 Reporter:  ckhroulev@…  |      Owner:  macports-tickets@…
     Type:  update       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.3.4
 Keywords:               |       Port:  udunits2
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 The udunits2 port should probably be updated to the latest version,
 2.2.20. The current version (2.1.24) is over 4 years old.

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Ticket URL: <https://trac.macports.org/ticket/50590>
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