[MacPorts] #56500: pacvim fails to build without C++11 support

[MacPorts]

#56500: pacvim fails to build without C++11 support
-------------------------------------------------+-------------------------
 Reporter:  ryandesign                           |      Owner:  (none)
     Type:  defect                               |     Status:  new
 Priority:  Normal                               |  Milestone:
Component:  ports                                |    Version:
 Keywords:  tiger leopard snowleopard lion       |       Port:  pacvim
  mountainlion                                   |
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 {{{
 cc1plus: error: unrecognized command line option "-std=c++11"
 }}}

 Try using the cxx11 1.1 portgroup? You'll also have to pass `CXXFLAGS` to
 the build system.

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Ticket URL: <https://trac.macports.org/ticket/56500>
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