[MacPorts] #39643: Upgrade virtualbox to 4.2.16

[MacPorts]

#39643: Upgrade virtualbox to 4.2.16
-------------------------------------+-------------------------------------
 Reporter:  mail@…                   |      Owner:  macports-tickets@…
     Type:  update                   |     Status:  new
 Priority:  Normal                   |  Milestone:
Component:  ports                    |    Version:  2.1.3
 Keywords:  virtualbox virtualbox-   |       Port:  virtualbox virtualbox-
  extension-pack virtualbox-guest-   |  extension-pack virtualbox-guest-
  additions                          |  additions
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 Please upgrade virtualbox and its sub-ports to version 4.2.16, which has
 been released this week:

 [http://www.virtualbox.org/wiki/Changelog]

 [http://download.virtualbox.org/virtualbox/4.2.16/]

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