[MacPorts] #60055: qt5-qtbase @5.14.1 doesn't build on 10.12

[MacPorts]

#60055: qt5-qtbase @5.14.1 doesn't build on 10.12
-----------------------+---------------------------------
 Reporter:  fhgwright  |      Owner:  MarcusCalhoun-Lopez
     Type:  defect     |     Status:  assigned
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.6.2
 Keywords:  Sierra     |       Port:  qt5-qtbase
-----------------------+---------------------------------
 It seems that the latest Qt has dropped support for Sierra, leading to a
 bunch of build failures.  So there probably needs to be yet another pinned
 version of qt5 for 10.12.  Dropping an OS between 5.14.0 and 5.14.1 was
 rather nasty.  Not going backwards would require creating a qt5140 (yuck),
 though if they'd officially dropped 10.12 support in 5.14.0 without
 actually failing until 5.14.1, then maybe pinning 10.12 at qt513 would be
 more consistent, albeit with some possible fallout from the backward jump.

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Ticket URL: <https://trac.macports.org/ticket/60055>
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