GHSA-JCJR-RH8Q-7XQF ln: rejects non-UTF-8 source filenames in target-directory mode

In target-directory forms ln SOURCE... DIRECTORY, ln rejects source paths with non-UTF-8 filename bytes, while GNU accepts them. Breaks GNU compatibility for byte-oriented filenames on Unix filesystems. PoC: name=$printf 'bad\377'; mkdir dst; : "$name"; ln "$name" dst GNU: exit 0, creates...