[MacPorts] #59696: redundant depends_fetch on port:git OR just use the port everywhere

[MacPorts]

#59696: redundant depends_fetch on port:git OR just use the port everywhere
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  Reporter:  RJVB         |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by ryandesign):

 I think you'll find (look with `port -v deps`) that the dependency we set
 is a `bin:`-style dependency, so that the system executable could satisfy
 the dependency, but if the system executable doesn't exist or if the port
 is already installed, the port's executable will be used, except that we
 require the MacPorts svn or git executables on macOS versions where the
 system version of the executable is too old to talk to popular services
 like GitHub or SourceForge. We have made no attempt to also require the
 MacPorts executables on old versions of non-macOS operating systems
 because we are not familiar with other operating systems.

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Ticket URL: <https://trac.macports.org/ticket/59696#comment:1>
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