[MacPorts] #64345: qt6-qtbase fails to build on 10.14

[MacPorts]

#64345: qt6-qtbase fails to build on 10.14
--------------------+------------------------
 Reporter:  jmroot  |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:  mojave  |       Port:  qt6-qtbase
--------------------+------------------------
 https://build.macports.org/builders/ports-10.14_x86_64-builder/builds/111651
 {{{
 /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_aqua_qt6/qt6-qtbase/work
 /qtbase-everywhere-
 src-6.2.1/src/gui/platform/darwin/qapplekeymapper.mm:534:45: error:
 property 'length' not found on object of type 'id'
                 if (charactersWithModifiers.length > 0)
                                             ^
 }}}

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Ticket URL: <https://trac.macports.org/ticket/64345>
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