[MacPorts] #28916: Update rabbitmq-server to version 2.4.0

[MacPorts]

#28916: Update rabbitmq-server to version 2.4.0
------------------------------------+---------------------------------------
 Reporter:  alexandru@…             |       Owner:  macports-tickets@…                   
     Type:  update                  |      Status:  new                                  
 Priority:  Normal                  |   Milestone:                                       
Component:  ports                   |     Version:                                       
 Keywords:  haspatch                |        Port:  rabbitmq-server                      
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 Rabbitmq-server version 2.4.0 has been released.  For more information,
 see the release announcement:
   http://lists.rabbitmq.com/pipermail/rabbitmq-
 discuss/2011-March/011985.html

 The attached patch updates the Portfile.

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Ticket URL: <https://trac.macports.org/ticket/28916>
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