[MacPorts] #64688: qt5-qtwebengine-gn fails to configure on OSX 10.13.6, macports 2.7.1

[MacPorts]

#64688: qt5-qtwebengine-gn fails to configure on OSX 10.13.6, macports 2.7.1
-------------------------------+--------------------------------
 Reporter:  rufty              |      Owner:  (none)
     Type:  defect             |     Status:  new
 Priority:  Normal             |  Milestone:
Component:  ports              |    Version:  2.7.1
 Keywords:  Configure failure  |       Port:  qt5-qtwebengine-gn
-------------------------------+--------------------------------
 Previously installed qt5-qtwebengine on upgrade pulls in qt5-qtwebengine-
 gn, which fails to configure:
 :info:configure gen.py: error: Unrecognized command line arguments:
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports
 .org_macports_release_tarballs_ports_devel_gn-devel/qt5-qtwebengine-
 gn/work/compwrap/cc/usr/bin/clang.

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Ticket URL: <https://trac.macports.org/ticket/64688>
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