[MacPorts] #57076: port diagnose: warn about incompatible archs

[MacPorts]

#57076: port diagnose: warn about incompatible archs
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 Reporter:  jmroot       |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  base         |    Version:
 Keywords:               |       Port:
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 `port diagnose` should look at the values of build_arch and
 universal_archs and warn about potential problems. These would include:
  * unknown arch names
  * archs that are not compatible with the hardware/OS we're running on
  * build_arch not being one of the archs listed in universal_archs

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Ticket URL: <https://trac.macports.org/ticket/57076>
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