[MacPorts] #63238: mdnsd @0.7G: update to 0.8.1

[MacPorts]

#63238: mdnsd @0.7G: update to 0.8.1
-------------------------+--------------------
 Reporter:  cooljeanius  |      Owner:  (none)
     Type:  update       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.7.1
 Keywords:               |       Port:  mdnsd
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 Given the issues I have had with mdnsd, I decided to fork it and start
 pushing releases of my own out.

 The sources for my version can be found here:
 https://github.com/cooljeanius/mdnsd

 It now includes libraries, the beginnings of a test suite, and bug fixes.

 The most recent release from my fork is 0.8.1, which can be found here:
 https://github.com/cooljeanius/mdnsd/releases/tag/v0.8.1

 I am attaching a Portfile and diff to update the mdnsd port to use this
 release instead.

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Ticket URL: <https://trac.macports.org/ticket/63238>
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