[libc-commits] [libc] [libc] Use relative inclusion for public headers. (PR #114324)

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lntue wrote:

> The commit lacks a description, such as addressing "why should we make this change?"
> 
> For the hunks that make the include line shorter, I like those changes. For the hunks that add `"../"` prefixes, I don't.
> 
> Is that the reason for this PR, or something else? Whatever it is, please update the description (or the commit message when merging).

Done.

https://github.com/llvm/llvm-project/pull/114324