[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:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Changes (by mf2k):

 * type:  request => enhancement


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Ticket URL: <https://trac.macports.org/ticket/52981#comment:4>
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