[MacPorts] #42415: wcslib: update to version 4.20

[MacPorts]

#42415: wcslib: update to version 4.20
---------------------------------+--------------------------------
 Reporter:  john@…               |      Owner:  macports-tickets@…
     Type:  defect               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.2.1
 Keywords:  haspatch maintainer  |       Port:  wcslib
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 As per subject, this updated wcslib to the current version.

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Ticket URL: <https://trac.macports.org/ticket/42415>
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