[MacPorts] #69662: port diagnose checks for Homebrew in /usr/local but not /opt/homebrew

[MacPorts]

#69662: port diagnose checks for Homebrew in /usr/local but not /opt/homebrew
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  Reporter:  ryandesign  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  base        |    Version:  2.9.2
Resolution:              |   Keywords:
      Port:              |
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Comment (by ryandesign):

 But some projects look there deliberately, like [ticket:64111 cmake did]
 until last week.

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Ticket URL: <https://trac.macports.org/ticket/69662#comment:2>
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