[MacPorts] #55471: Use separate portindexes for libc++ on older systems

[MacPorts]

#55471: Use separate portindexes for libc++ on older systems
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  Reporter:  ryandesign   |      Owner:  neverpanic
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:  MacPorts 2.5.0
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by ryandesign):

 In [changeset:"d49c4fb8a1b05684bb8a6d0c542b20218b886bc0/macports-base"
 d49c4fb8a1b05684bb8a6d0c542b20218b886bc0/macports-base] (master):
 {{{
 #!ConfigurableCommitTicketReference repository="macports-base"
 revision="d49c4fb8a1b05684bb8a6d0c542b20218b886bc0"
 portindex: support creating PortIndex for libc++

 See: https://trac.macports.org/ticket/55471
 }}}

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Ticket URL: <https://trac.macports.org/ticket/55471#comment:33>
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