[MacPorts] #66956: qbittorrent @4.5.1: build failure, undefined symbols for std::filesystem on 10.14

[MacPorts]

#66956: qbittorrent @4.5.1: build failure, undefined symbols for std::filesystem on
10.14
----------------------------+------------------------
  Reporter:  contextnerror  |      Owner:  i0ntempest
      Type:  defect         |     Status:  closed
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.8.1
Resolution:  fixed          |   Keywords:  mojave
      Port:  qBittorrent    |
----------------------------+------------------------

Comment (by i0ntempest):

 Looks like legacysupport magic doesn't work for the qt5 port because it's
 using qmake, and I'll need to manually add the variables in to point it to
 the new libcxx. I don't have libcxx port since I'm running the newest OS,
 can you please post the output of {{{port content libcxx}}}?

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Ticket URL: <https://trac.macports.org/ticket/66956#comment:15>
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