[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 royliu@…):

 I've attached a non-working patch, which represents my progress so far.
 There are a few things left to be done:

   1. Sort out the `PVM` macro conflict. Apparently 10.8 defines it, and
 this conflicts with VirtualBox's own definition, which means "pointer to
 the `VM` struct".
   2. Modernize deprecated use of the Carbon API.

 It's going to be a challenge to get VirtualBox to build, and I just don't
 have to time to devote to this.

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Ticket URL: <https://trac.macports.org/ticket/40786#comment:13>
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