i386: Use generic memrchr in libc (bug 31316)
Before this change, we incorrectly used the SSE2 variant in the
implementation, without checking that the system actually supports
SSE2.
Tested-by: 
Sam James <sam@gentoo.org>
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Before this change, we incorrectly used the SSE2 variant in the
implementation, without checking that the system actually supports
SSE2.
Tested-by: Sam James <sam@gentoo.org>