[MacPorts] #67425: bmake fails on Rosetta

[MacPorts]

#67425: bmake fails on Rosetta
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  Reporter:  barracuda156  |      Owner:  ryandesign
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:  snowleopard, powerpc, rosetta
      Port:  bmake         |
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Comment (by barracuda156):

 `os.sh` is broken: it uses `MACHINE=uname -m`, which gives out `Power
 Macintosh`, and that value fails to work.

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Ticket URL: <https://trac.macports.org/ticket/67425#comment:2>
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