[MacPorts] #50775: haproxy: update to 1.6.3

[MacPorts]

#50775: haproxy: update to 1.6.3
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  Reporter:  relgames@…  |      Owner:  sam@…
      Type:  update      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  haproxy     |
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Comment (by dluke@…):

 The stronger hashes main function is to ensure that the file that an end-
 user operates on is the same file as the one the maintainer intended it to
 operate on.

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Ticket URL: <https://trac.macports.org/ticket/50775#comment:3>
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