[MacPorts] #63050: xorg-server: auto-select correct version for macOS release, rather than fail with "use xorg-server-legacy instead"

[MacPorts]

#63050: xorg-server: auto-select correct version for macOS release, rather than
fail with "use xorg-server-legacy instead"
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  Reporter:  mascguy      |      Owner:  jeremyhu
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  xorg-server  |
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Comment (by mascguy):

 Well, depending on `xorg` isn't going to work either, because it's
 dependent on - drumroll, please - `xorg-server`.

 Perhaps there should be fallback logic in that port then?

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Ticket URL: <https://trac.macports.org/ticket/63050#comment:3>
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