[MacPorts] #49092: libcxx and libcxxabi packages should be updated to 3.7.0

[MacPorts]

#49092: libcxx and libcxxabi packages should be updated to 3.7.0
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 Reporter:  howarth.at.macports@…  |      Owner:  macports-tickets@…
     Type:  request                |     Status:  new
 Priority:  Normal                 |  Milestone:
Component:  ports                  |    Version:  2.3.4
 Keywords:                         |       Port:  libcxx libcxxabi
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 The libcxx and libcxxabi packages are still based on llvm 3.6.0 despite
 the addition of the new 3.7.0 stable release to MacPorts.

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Ticket URL: <https://trac.macports.org/ticket/49092>
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