[MacPorts] #36395: gcc47: update to 4.7.2

[MacPorts]

#36395: gcc47: update to 4.7.2
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  Reporter:  manphiz@…  |      Owner:  mww@…
      Type:  update     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.1.2
Resolution:             |   Keywords:  haspatch
      Port:  gcc47      |
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Comment (by jeremyhu@…):

 Also, your patch ignored this comment:
 {{{
 # When version is updated, please delete the separate revision for
 libstdcxx below (and delete this comment)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/36395#comment:3>
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