[MacPorts] #45091: Adding HHVM Portfile

[MacPorts]

#45091: Adding HHVM Portfile
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  Reporter:  cornelius.howl@…  |      Owner:  macports-tickets@…
      Type:  submission        |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.3.1
Resolution:                    |   Keywords:
      Port:  hhvm              |
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Comment (by cornelius.howl@…):

 It uses gcc extensions like (features.h) which is not supported by clang.

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Ticket URL: <https://trac.macports.org/ticket/45091#comment:6>
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