[MacPorts] #69000: libcxx-powerpc: can we get rid of depending on system libstdc++ completely?

[MacPorts]

#69000: libcxx-powerpc: can we get rid of depending on system libstdc++ completely?
-----------------------------+-------------------------------------------
  Reporter:  barracuda156    |      Owner:  catap
      Type:  defect          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.8.1
Resolution:                  |   Keywords:  leopard, snowleopard, powerpc
      Port:  libcxx-powerpc  |
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Comment (by barracuda156):

 Replying to [comment:5 catap]:
 > Replying to [comment:4 barracuda156]:
 > > Do we need to include `cxa_atexit` in the build? Or if not, do we need
 to pass `-fno-use-cxa-atexit`?
 >
 > Yes, you really need it.
 >
 > See: https://refspecs.linuxfoundation.org/LSB_1.3.0/gLSB/gLSB/baselib
 ---cxa-atexit.html

 Already done, but it does not solve the issue with `icu` build.

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Ticket URL: <https://trac.macports.org/ticket/69000#comment:6>
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