Move LIBC_CONF_STRING_UNSAFE_WIDE_READ to top-level libc-configuration (#165046) This options sets a compile option when building sources inside the string directory, and this option affects string_utils.h. But string_utils.h is #included from more places than just the string directory (such as from __support/CPP/string.h), leading to both narrow-reads in those cases, but more seriously, ODR violations when the two different string_length implementations are included int he same program. Having this option at the top level avoids this problem.
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