[MacPorts] #58526: gettext: update to 0.21

[MacPorts]

#58526: gettext: update to 0.21
----------------------+------------------------
  Reporter:  akimd    |      Owner:  ryandesign
      Type:  update   |     Status:  accepted
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:  haspatch
      Port:  gettext  |
----------------------+------------------------

Comment (by akimd):

 Congratulations!  That particular change appears to require heroic
 endurance!

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Ticket URL: <https://trac.macports.org/ticket/58526#comment:36>
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