[MacPorts] #35665: haproxy: update to 1.4.21

[MacPorts]

#35665: haproxy: update to 1.4.21
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 Reporter:  ryandesign@…             |       Owner:  sam@…              
     Type:  update                   |      Status:  new                
 Priority:  Normal                   |   Milestone:                     
Component:  ports                    |     Version:                     
 Keywords:  haspatch                 |        Port:  haproxy            
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Changes (by ryandesign@…):

  * keywords:  => haspatch


Comment:

 Here's a simple patch to do this update. May I commit it?

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Ticket URL: <https://trac.macports.org/ticket/35665#comment:1>
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