[MacPorts] #34680: port atlas - remove ui_warn command from top level, add maintainer

[MacPorts]

#34680: port atlas - remove ui_warn command from top level, add maintainer
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 Reporter:  and.damore@…             |       Owner:  jameskyle@…           
     Type:  defect                   |      Status:  new                   
 Priority:  Normal                   |   Milestone:                        
Component:  ports                    |     Version:  2.1.1                 
 Keywords:                           |        Port:  atlas                 
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Comment(by vince@…):

 PS: I have moved the message in the "pre-fetch" phase, because I want the
 user to be warned early of this limitation (so that he may abort and opt
 for clang, for example).

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Ticket URL: <https://trac.macports.org/ticket/34680#comment:3>
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