[MacPorts] #59358: Add python2_qstring.diff debian patch to py-pyqt5 in order to fix pymol crashes under python27 and py27-pyqt5

[MacPorts]

#59358: Add python2_qstring.diff debian patch to py-pyqt5 in order to fix pymol
crashes under python27 and py27-pyqt5
------------------------+----------------------
  Reporter:  jwhowarth  |      Owner:  mamoll
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  haspatch
      Port:  py-pyqt5   |
------------------------+----------------------

Comment (by cjones051073):

 https://github.com/macports/macports-ports/pull/5548

 jwhowarth - In future please consider opening github PRs directly yourself
 rather than trac tickets with patchfiles. Its so much more convenient in
 terms to getting the fix applied.

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Ticket URL: <https://trac.macports.org/ticket/59358#comment:5>
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