[MacPorts] #40786: virtualbox and sub-ports: update to 4.3

[MacPorts]

#40786: virtualbox and sub-ports: update to 4.3
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  Reporter:  mail@…                              |      Owner:  macports-
      Type:  update                              |  tickets@…
  Priority:  Normal                              |     Status:  new
 Component:  ports                               |  Milestone:
Resolution:                                      |    Version:
      Port:  virtualbox virtualbox-extension-    |   Keywords:
  pack virtualbox-guest-additions                |
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Comment (by emer@…):

 I'm taking a look. I agree with royliu at macports.org, this is going to be a
 hell of an effort to get this to build. It's going to be a little while.

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Ticket URL: <https://trac.macports.org/ticket/40786#comment:14>
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