[MacPorts] #39643: virtualbox: update to 4.2.16

[MacPorts]

#39643: virtualbox: update to 4.2.16
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  Reporter:  mail@…                              |      Owner:  macports-
      Type:  update                              |  tickets@…
  Priority:  Normal                              |     Status:  closed
 Component:  ports                               |  Milestone:
Resolution:  fixed                               |    Version:
      Port:  virtualbox virtualbox-extension-    |   Keywords:
  pack virtualbox-guest-additions                |
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Comment (by jmr@…):

 How does updating virtualbox affect ld64? It's not even a dependency. It's
 possible that ld64 needed a rev bump for other reasons, but that doesn't
 mean it should be rev bumped on every virtualbox update as suggested by
 your portfile comment.

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Ticket URL: <https://trac.macports.org/ticket/39643#comment:9>
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