[MacPorts] #69214: *.pc files required by pkg-config are missing

[MacPorts]

#69214: *.pc files required by pkg-config are missing
--------------------+--------------------
 Reporter:  jyssh   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  qt6
--------------------+--------------------
 Early versions of Qt6 [https://github.com/microsoft/vcpkg/issues/25988
 did] [https://bugzilla.redhat.com/show_bug.cgi?id=2110769 not]
 [https://codereview.qt-project.org/c/qt/qtbase/+/405678 install] `*.pc`
 files required by pkg-config in `qt_dir/lib/pkgconfig` path (which should
 be `/opt/local/libexec/qt6/lib/pkgconfig` in MacPorts's case, if we follow
 the lead of qt5 package).

 While this seems to have been resolved at the time of this writing in qt6
 packages in other package management systems, MacPorts's package may not
 have it fixed yet.

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Ticket URL: <https://trac.macports.org/ticket/69214>
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