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

[MacPorts]

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

Comment (by larryv@…):

 Vim’s Tcl highlighting is mediocre at best. I tend to ignore it.
 {{{
 [titan] 92134 % rlwrap port-tclsh
 % set foo {x86_64 ppc64}
 x86_64 ppc64
 % expr {"x86_64" in $foo}
 1
 % expr {"i386" in $foo}
 0
 }}}

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Ticket URL: <https://trac.macports.org/ticket/48192#comment:4>
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