[MacPorts] #55165: harfbuzz @1.6.3: cc1plus: error: unrecognized command line option "-std=c++11"

[MacPorts]

#55165: harfbuzz @1.6.3: cc1plus: error: unrecognized command line option
"-std=c++11"
-----------------------+------------------------
  Reporter:  kencu     |      Owner:  ryandesign
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  haspatch
      Port:  harfbuzz  |
-----------------------+------------------------

Comment (by ballapete):

 Replying to [comment:7 ryandesign]:
 > In [changeset:"38bdb8ebd6cbaaf98fc63d04084c0a190e59e86c/macports-ports"
 38bdb8ebd6cbaaf98fc63d04084c0a190e59e86c/macports-ports]:
 > {{{
 > #!ConfigurableCommitTicketReference repository="macports-ports"
 revision="38bdb8ebd6cbaaf98fc63d04084c0a190e59e86c"
 > harfbuzz: Keep Snow Leopard and earlier on harfbuzz 1.5.1
 > }}}

 I think `harfbuzz-icu` needs to be handled the same way.

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Ticket URL: <https://trac.macports.org/ticket/55165#comment:8>
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