Make normalize_to_root return best-effort

The previous verion failed if recursive `root.parent()` reached an
error, but thinking about it, if the two paths have different starting
points (like Windows drives), then the desirable function would be to
return the absolute target path as-is. Naturally, the current funtion
gives a wrong output if the supplied arguments are not absolute, but
that shall be enforced using a future test.

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