[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:
 Keywords:           |       Port:  xorg-server
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 Presently, this port fails to install on macOS 10.10 and earlier, with the
 error "xorg-server requires macOS 10.11 or later. Please use the xorg-
 server-legacy port instead."

 This isn't user-friendly, and there's no reason the port can't gracefully
 select an older release if necessary. Furthermore, it complicates
 dependent ports: The fallback logic that arguably should be encapsulated
 in this port, is necessary in every dependent.

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