[MacPorts] #50708: Base should support fetching git submodules (git submodule update)

[MacPorts]

#50708: Base should support fetching git submodules (git submodule update)
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  Reporter:  mojca@…  |      Owner:  macports-tickets@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  base     |    Version:  2.3.4
Resolution:           |   Keywords:
      Port:           |
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Comment (by ryandesign@…):

 Sounds like the current instructions for how to use submodules in the
 github portgroup are insufficient, because they don't mention using a
 shasum for submodule updates. If so, please update the instructions. Many
 ports follow those instructions and will need updates too.

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Ticket URL: <https://trac.macports.org/ticket/50708#comment:4>
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