GLIBC patches accepted: fixes for memchr

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Two fixes for memchr for Power architecture accepted in GLIBC. The first is an obvious copy-paste error in the memchr implementation for powerpc32 (commit 854e005).

The second is a fix for the IFUNC selector that was wrongly picking the internal __GI_memchr implementation instead of the optimized __memchr_power7 version (commit 502b91d).