[MacPorts] #20743: apache2 update to 2.2.13

[MacPorts]

#20743: apache2 update to 2.2.13
------------------------------+---------------------------------------------
 Reporter:  nox@…             |       Owner:  imajes@…           
     Type:  update            |      Status:  new                
 Priority:  Normal            |   Milestone:                     
Component:  ports             |     Version:                     
 Keywords:                    |        Port:  apache2            
------------------------------+---------------------------------------------
 Changes:
  * Update to 2.2.13.
  * MPM variants now conflict against each other and preforkmpm is always
 selected by default (closes #20516).

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Ticket URL: <http://trac.macports.org/ticket/20743>
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