[MacPorts] #59685: Harfbuzz expects/requires Python 3.6

[MacPorts]

#59685: Harfbuzz expects/requires Python 3.6
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 Reporter:  physicsbeany  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.6.2
 Keywords:                |       Port:  harfbuzz
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 After upgrading XCode on my Mojave (MacOS 10.14.6) machine, I tried a
 clean reinstall of some ports, including libxml2. This now fails because
 it's specifically looking for Python 3.6 --- I have 2.7 and 3.7.

 Attaching failed installation logfile.

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Ticket URL: <https://trac.macports.org/ticket/59685>
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