[MacPorts] #52981: Print custom warnings from Portfile with `port info`

[MacPorts]

#52981: Print custom warnings from Portfile with `port info`
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  Reporter:  RJVB     |      Owner:
      Type:  request  |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  base     |    Version:
Resolution:           |   Keywords:
      Port:           |
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Comment (by RJVB):

 Replying to [comment:2 raimue]:
 > Abusing and overriding the phase from the port client is a horrible
 hack.

 If you say so. I call it a proof-of-concept approach meant to evaluate the
 side-effects of activating ui_info during port info (something that at
 least has the merit of being simple and intuitive) and the most
 straightforward solution to explore.

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Ticket URL: <https://trac.macports.org/ticket/52981#comment:3>
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