[MacPorts] #61031: qt5*-qtlocation: build errors due to <experimental/optional> removal

[MacPorts]

#61031: qt5*-qtlocation: build errors due to <experimental/optional> removal
-----------------------------------------------+---------------------------
  Reporter:  chrstphrchvz                      |      Owner:
                                               |  MarcusCalhoun-Lopez
      Type:  defect                            |     Status:  assigned
  Priority:  Normal                            |  Milestone:
 Component:  ports                             |    Version:  2.6.3
Resolution:                                    |   Keywords:
      Port:  qt59-qtlocation qt511-qtlocation  |
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Comment (by chrstphrchvz):

 I have successfully built qt59-qtlocation on macOS 12 by adding the 3rd-
 party <experimental/optional> header and updating the mapbox-gl-native
 build configuration (as done in slightly newer qtlocation), and
 backporting a build fix from upstream mapbox-gl-native. To be added to
 https://github.com/macports/macports-ports/pull/15454

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Ticket URL: <https://trac.macports.org/ticket/61031#comment:8>
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