[MacPorts] #58526: gettext: update to 0.21

[MacPorts]

#58526: gettext: update to 0.21
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  Reporter:  akimd    |      Owner:  ryandesign
      Type:  update   |     Status:  accepted
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:  haspatch
      Port:  gettext  |
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Comment (by mascguy):

 Observers: Despite the commit message - and you can probably blame me, as
 that was overlooked - `getext` was updated to 0.21. Sorry for any
 confusion, but the key is that it's finally been merged!

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Ticket URL: <https://trac.macports.org/ticket/58526#comment:35>
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