[PATCH] Implement protection key support for POWER

[Florian Weimer]

This still does not address the misc/tst-pkeys failure because there are 
kernel bugs.

I'm not entirely sure if the 32-bit AMR mapping is correct because the 
kernel allocates keys starting with the MSB position.  If in doubt, we 
could make this specific to powerpc64.

Thanks,
Florian
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