[MacPorts] #50622: virtualbox: update to 5.1.2

[MacPorts]

#50622: virtualbox: update to 5.1.2
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  Reporter:  1-61803                             |      Owner:  macports-
                                                 |  tickets@…
      Type:  update                              |     Status:  new
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:
      Port:  virtualbox virtualbox-extension-    |
  pack virtualbox-guest-additions                |
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Comment (by kencu):

 I think it would be very cool to have the ability to build virtualbox
 again in MacPorts. If you're looking for encouragement, consider this it!

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Ticket URL: <https://trac.macports.org/ticket/50622#comment:11>
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