[MacPorts] #58898: libcxx bootstrapping needs a method to upgrade to the +emulatedtls variant on 10.6 and less

[MacPorts]

#58898: libcxx bootstrapping needs a method to upgrade to the +emulatedtls variant
on 10.6 and less
---------------------+---------------------------------------
  Reporter:  kencu   |      Owner:  jeremyhu
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  snowleopard leopard tiger
      Port:  libcxx  |
---------------------+---------------------------------------

Comment (by kencu):

 so the revesion +1 idea if a clang >= 5.0 is found is one way to farce the
 update.

 could also exist a libcxx-bootstrap port.

 Maybe that is more appropriate?

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Ticket URL: <https://trac.macports.org/ticket/58898#comment:6>
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