[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):

 shame we can't depend on a port variant..

 So libcxx on < 10.7 would have to depend on libcxx-bootstrap. Tha's simple
 enough. But it would also have to depend on some clang >= 5.0, and that is
 circular.

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Ticket URL: <https://trac.macports.org/ticket/58898#comment:10>
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