[MacPorts] #52575: Report Xcode version and other useful information in main.log

[MacPorts]

#52575: Report Xcode version and other useful information in main.log
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  Reporter:  mojca        |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.3.4
Resolution:               |   Keywords:
      Port:               |
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Comment (by raimue):

 I added some basic information in above commit. Feel free to extend
 `macports::_log_sysinfo` with more information you want to see in the log
 file.

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Ticket URL: <https://trac.macports.org/ticket/52575#comment:6>
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