libroot: Replace swab() with the musl version.

This was the last function remaining in the glibc "string" directory,
so now we can remove that directory and a bunch of related files
that are no long

libroot: Replace swab() with the musl version.

This was the last function remaining in the glibc "string" directory,
so now we can remove that directory and a bunch of related files
that are no longer needed.

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