[libc++] Remove the need for `uselocale()` (#120158) Instead of requiring `uselocale()` as part of the base locale API, define __locale_guard in the few places that need it directly, without making __locale_guard part of the base API. In practice, most mainstream platforms never used __locale_guard, so they also didn't need to define uselocale(), and after this patch they actually don't define it anymore.
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