[MacPorts] #33230: libevent: update to version 2.0.17

[MacPorts]

#33230: libevent: update to version 2.0.17
------------------------------+---------------------------------------------
 Reporter:  jpo@…             |       Owner:  brett@…           
     Type:  update            |      Status:  new               
 Priority:  Normal            |   Milestone:                    
Component:  ports             |     Version:  2.0.3             
 Keywords:  haspatch          |        Port:  libevent          
------------------------------+---------------------------------------------

Comment(by dargo@…):

 please commit this. it fixes a lot of serious issues.

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Ticket URL: <https://trac.macports.org/ticket/33230#comment:2>
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