[MacPorts] #55644: bitcoin: Update to 0.15.1

[MacPorts]

#55644: bitcoin: Update to 0.15.1
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  Reporter:  ryandesign  |      Owner:  easieste@…
      Type:  update      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  bitcoin     |
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Comment (by ryandesign):

 Sorry, a PR already exists for this here: https://github.com/macports
 /macports-ports/pull/1150

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Ticket URL: <https://trac.macports.org/ticket/55644#comment:1>
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