[MacPorts] #59737: webkit2-gtk @2.26.2 +quartz build failure on 10.13

[MacPorts]

#59737: webkit2-gtk @2.26.2 +quartz build failure on 10.13
--------------------+-------------------------
 Reporter:  maehne  |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  webkit2-gtk
--------------------+-------------------------
 webkit2-gtk @2.26.2 +quartz fails to build on macOS 10.13.6 and maybe
 other versions. Before that version, the port was built as a dependency
 without any issue. Attached, you can find the build log.

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Ticket URL: <https://trac.macports.org/ticket/59737>
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