[MacPorts] #48192: libass: update to 0.12.2, port to GitHub

[MacPorts]

#48192: libass: update to 0.12.2, port to GitHub
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  Reporter:  ionic@…  |      Owner:  coax@…
      Type:  update   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:  haspatch
      Port:  libass   |
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Comment (by ionic@…):

 Are you sure that works? `vim`'s syntax highlighting doesn't like it.

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Ticket URL: <https://trac.macports.org/ticket/48192#comment:3>
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