[build] Cleanup rs6000/t-ppccomm configurations (PR other/51022)

[Rainer Orth]

Joel,

> Works for me.  I posted test results for powerpc-rtems4.11
> at http://gcc.gnu.org/ml/gcc-testresults/2011-11/msg02314.html
>
> From the rtems perspective, you can commit it.

thanks for the confirmation.  It would be great if one of the powerpc
maintainers could review it.

Thanks.
        Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University