[v3] enable 30_threads tests on AIX

[Jonathan Wakely]

        PR libstdc++/50982
        * testsuite/30_threads/*: Add powerpc-ibm-aix* to target selectors.

This adds powerpc-ibm-aix* to the dg target selectors in 30_threads.
As explained in http://gcc.gnu.org/ml/libstdc++/2012-01/msg00126.html
those tests won't run by default, but can be run using:

make check RUNTESTFLAGS="--target_board=unix/-pthread"

I've tested this on x86_64-linux without problems and David has tested
a partial version of this patch on AIX.  I've committed it to trunk
and we'll monitor the AIX testresults for any new failures and deal
with them if/when they happen.
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