[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:  raimue
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:  MacPorts Future
 Component:  base    |    Version:  2.3.4
Resolution:          |   Keywords:
      Port:          |
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Comment (by RJVB):

 Some thoughts of mine on this subject here, with a minimally changed
 alternate github PG that overrides the relevant procedure from "base":
 #72439

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Ticket URL: <https://trac.macports.org/ticket/50708#comment:17>
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