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Revert "Switch to Arm Optimized Routines for mem* & str*"

Description

Revert "Switch to Arm Optimized Routines for mem* & str*"

The Arm Optimized Routines don't exist in 13. I missed this as my
builds succeeded, likely due to stale depends files.

This reverts commit bfd10d146ba4f8dc26e8b9bb9013a9316105f11a.