[MacPorts] #43766: wcslib: fix library install_name

[MacPorts]

#43766: wcslib: fix library install_name
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  Reporter:  ryandesign@…  |      Owner:  john@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.3.99
Resolution:                |   Keywords:
      Port:  wcslib        |
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Comment (by ryandesign@…):

 Thanks. I was hoping there would be a variable that could be accessed from
 the configure script to get the library directory (`$libdir`?), to avoid
 having to reinplace the prefix.

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Ticket URL: <https://trac.macports.org/ticket/43766#comment:2>
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