[MacPorts] #54065: nss @3.29.5_0 won't build on PPC Tiger, Mac OS X 10.4.11 because assembler fails due to useless GCC argument -arch ${build_arch}

[MacPorts]

#54065: nss @3.29.5_0 won't build on PPC Tiger, Mac OS X 10.4.11 because assembler
fails due to useless GCC argument -arch ${build_arch}
------------------------+---------------------
  Reporter:  ballapete  |      Owner:
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.1
Resolution:             |   Keywords:  powerpc
      Port:  nss        |
------------------------+---------------------

Comment (by ballapete):

 The build succeeds with `configure.compiler=macports-gcc-6`.

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Ticket URL: <https://trac.macports.org/ticket/54065#comment:1>
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