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[PowerPC64] Use signal to detect CPU features when getauxval() isn't available

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Closed Maamoun TK requested to merge mamonet/nettle:ppc-fat-signal into master Dec 18, 2020
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This patch use signal functions and inline assembly to detect CPU features when glibc version is older than 2.16 where getauxval() has not been added yet.

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Source branch: ppc-fat-signal