acls (linux): use surrogatescape error handling for acl_append_numeric_ids and acl_numeric_ids
acls (linux): use surrogatescape error handling for acl_append_numeric_ids and acl_numeric_ids

surrogatescape will decode/encode invalid utf-8 sequences (if we do not get utf-8) in a round-tripping way.

edgewood/borg,RonnyPfannschmidt/borg,edgewood/borg,edgimar/borg,edgewood/borg,edgewood/borg,mhubig/borg,raxenak/borg,edgimar/borg,mhubig/borg,raxenak/borg,RonnyPfannschmidt/borg,RonnyPfannschmidt/borg,edgimar/borg,RonnyPfannschmidt/borg,raxenak/borg,RonnyPfannschmidt/borg,mhubig/borg,edgimar/borg,raxenak/borg