[MacPorts] #60045: qt5-qtbase @5.14.1 does not build on OSX 10.12

[MacPorts]

#60045: qt5-qtbase @5.14.1 does not build on OSX 10.12
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 Reporter:  Greisby  |      Owner:  (none)
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:
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 Upgrading my macports fails due to QT 5.14 that is not supported on this
 version of MacOS.
 In the log I have:

 qcocoadrag.mm:137:42: error: 'NSPasteboardNameDrag' is only available on
 macOS 10_13 or newer

 And on the site of Qt it's said that the requirement are indeed 10.13+

 A new branch should be added for qt 5.12.

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Ticket URL: <https://trac.macports.org/ticket/60045>
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