[MacPorts] #29419: libevent: update to 2.0.11

[MacPorts]

#29419: libevent: update to 2.0.11
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 Reporter:  ryandesign@…             |       Owner:  brett@…           
     Type:  update                   |      Status:  new               
 Priority:  Normal                   |   Milestone:                    
Component:  ports                    |     Version:                    
 Keywords:                           |        Port:  libevent          
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 libevent should presumably be updated to 2.0.11.

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Ticket URL: <https://trac.macports.org/ticket/29419>
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