[MacPorts] #38720: Add a port for bup (https://github.com/bup/bup)

[MacPorts]

#38720: Add a port for bup (https://github.com/bup/bup)
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  Reporter:  mail@…   |      Owner:  macports-tickets@…
      Type:  request  |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  bup      |
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Comment (by egall@…):

 Also on a slightly different note, there's a Homebrew formula for bup that
 we could use as reference when making this portfile:
 https://github.com/mxcl/homebrew/commits/master/Library/Formula/bup.rb

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Ticket URL: <https://trac.macports.org/ticket/38720#comment:7>
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