[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 jwhowarth):

 Also confirmed that fix on Mojave with Xcode 10.2.1 eliminates the pymol
 crashes with the python27 variant under the Qt interface.

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Ticket URL: <https://trac.macports.org/ticket/59358#comment:3>
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