[MacPorts] #70077: The stub PG should (be able to) clear all pre- and post- blocks

[MacPorts]

#70077: The stub PG should (be able to) clear all pre- and post- blocks
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  Reporter:  RJVB         |      Owner:  mascguy
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by ryandesign):

 Maybe you can provide an example portfile that demonstrates where the
 existing method would be particularly inconvenient.

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Ticket URL: <https://trac.macports.org/ticket/70077#comment:7>
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