[MacPorts] #58120: libpsl: move build dependencies to python3

[MacPorts]

#58120: libpsl: move build dependencies to python3
-----------------------+--------------------
  Reporter:  dmarteau  |      Owner:  (none)
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.5.4
Resolution:            |   Keywords:
      Port:  libpsl    |
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Comment (by dmarteau):

 The README file says that "You should have python2.7+ installed.", which
 include python3.

 From the release notes:
 {{
 09.11.2017 Release V0.19.0
 ...
 * psl_make_dafsa now works with python2 and python3
 ...
 }}

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Ticket URL: <https://trac.macports.org/ticket/58120#comment:2>
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