[MacPorts] #62792: legacy-support: rename identifiers that start with underscore

[MacPorts]

#62792: legacy-support: rename identifiers that start with underscore
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  Reporter:  ryandesign      |      Owner:  cjones051073
      Type:  defect          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.6.4
Resolution:                  |   Keywords:
      Port:  legacy-support  |
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Comment (by jmroot):

 The reason these identifiers are reserved is so the standard library can
 use them without fear of introducing name collisions in programs. Given
 how legacysupport works, it is in the same position as the standard
 library in this respect, and could be considered an (unofficial) part of
 it.

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Ticket URL: <https://trac.macports.org/ticket/62792#comment:1>
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