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linux: Enable :SB-FUTEX by default on PPC.

* Prior to the great de-lutexification, we used futexes on
threaded Linux/PPC. Not having them enabled on PPC was an
oversight, but one which highlighted some problems with the
non-futex threading code. Now that that's fixed, we may as
well restore the status quo.

Alastair Bridgewater Alastair Bridgewater 2011-11-22

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