[MacPorts] #46241: git-flow update: bump subport git-flow-avh v1.7.0 -> v1.8.0

[MacPorts]

#46241: git-flow update: bump subport git-flow-avh v1.7.0 -> v1.8.0
-------------------------------+---------------------------------
  Reporter:  jason-macports@…  |      Owner:  macports-tickets@…
      Type:  update            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.3.3
Resolution:                    |   Keywords:  haspatch maintainer
      Port:  git-flow-avh      |
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Comment (by jason-macports@…):

 Replying to [comment:2 ryandesign@…]:
 > Why doesn't this subport fetch from a distfile? The other three subports
 use `git submodule update --init`, which is a valid reason to use
 `fetch.type git`, but git-flow-avh doesn't.


 Combination limited time and ignorance on my part.  A quick peek at
 `github-1.0.tcl` showed no `github.tarball_from` option matched the
 `github.master_sites` results in the switch `switch` for the ''`archive`''
 focused URL in [https://github.com/petervanderdoes/gitflow/releases
 gitflow AVH's release page].  Since `github-1.0.tcl` specifically mentions
 `github.master_sites` expects a simple string and not a list, I fumbled to
 build a recipe for the right `tarball_from`.  The `clone` worked, so I
 stuck with it.

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Ticket URL: <https://trac.macports.org/ticket/46241#comment:4>
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