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Deny --copy-unsafe-links inside a restricted (non-"/") rrsync directory (it dereferences a symlink pointing outside the tree and copies the referent out -- exfiltration), and don't abort the run when flock() is unavailable. Test: rrsync-copy-unsafe-links-denied. (cherry picked from commit beaae13ff25d5a8f4435010e0531116fb1d00742)