[google/gcc-4_7]Add new validator file for native ppc toolchain

[Jing Yu]

Add new validator manifest xfail file for native powerpc64 toolchain.
Ok for google/gcc-4_7?

Tested:
./validate_failures.py
--manifest=powerpc64-grtev3-linux-gnu-native.xfail --
results="gcc/gcc.sum g++/g++.sum gfortran/gfortran.sum"

2013-06-05    <jin...@google.com>

         * powerpc64-grtev3-linux-gnu-native.xfail: New.

patch.diff
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