cp: fix backup of destination symlink #5731
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When using
cp -b a symlink, GNUcpbackupssymlinkassymlink~and then overwritessymlinkwitha(and thussymlinkis no longer a symlink). uutilscp, on the other hand, backups the target of the symlink assymlink~and then overwrites the target of the symlink witha(and thussymlinkremains a symlink). This PR fixes this behavior.