[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):

 Either way, it's ridiculous that this is being argued about. It's
 absolutely NOT user-friendly, and would be trivial to fix.

 Heck, the amount of time spent on this ticket, is such that I could have
 implemented - and tested - fallback in `xorg-server`.

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Ticket URL: <https://trac.macports.org/ticket/63050#comment:4>
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