[MacPorts] #53452: taglib: opportunistically links with boost

[MacPorts]

#53452: taglib: opportunistically links with boost
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  Reporter:  ctreleaven  |      Owner:  ryandesign
      Type:  defect      |     Status:  accepted
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  taglib      |
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Comment (by ctreleaven):

 Attached patch fixes the opportunistic linking with boost as well as
 adding variants to perform unit tests and build example programs.

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Ticket URL: <https://trac.macports.org/ticket/53452#comment:3>
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