[MacPorts] #38758: update gcc48 to 4.8.0 release and change libstdc++-devel subport to libstdc++

[MacPorts]

#38758: update gcc48 to 4.8.0 release and change libstdc++-devel subport to
libstdc++
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  Reporter:  howarth@…  |      Owner:  mww@…
      Type:  update     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  haspatch
      Port:  gcc48      |
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Comment (by howarth@…):

 Updated the Portfile diff in order to eliminate the usage of two different
 unwinders with code linked against libstdc++. See ticket 38732.

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Ticket URL: <https://trac.macports.org/ticket/38758#comment:3>
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