[MacPorts] #66741: macports: provide version info to Apple system information

[MacPorts]

#66741: macports: provide version info to Apple system information
-----------------------+-----------------------------
  Reporter:  Zweihorn  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:  MacPorts Future
 Component:  base      |    Version:  2.8.0
Resolution:            |   Keywords:
      Port:            |
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Comment (by jmroot):

 I'm not sure what's needed here. We already use the `--version` option
 when running pkgbuild: https://github.com/macports/macports-
 base/blob/v2.8.1/src/package1.0/portpkg.tcl#L170

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Ticket URL: <https://trac.macports.org/ticket/66741#comment:5>
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