[MacPorts] #23461: Add debug mode variant

[MacPorts]

#23461: Add debug mode variant
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 Reporter:  y8@…         |       Owner:  macports-tickets@…                   
     Type:  enhancement  |      Status:  new                                  
 Priority:  Normal       |   Milestone:                                       
Component:  ports        |     Version:  1.8.2                                
 Keywords:               |        Port:  nginx                                
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 Enables extended debug log.

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Ticket URL: <http://trac.macports.org/ticket/23461>
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