xdg_user_dirs() doesn't seem well-organized currently. In all other xdg_user_*() funcs we assume /etc/xdg/systemd to be a symlink to /etc/systemd/, hence it is the odd one out. Also, when the relevant envvar is unset, it only returns the global search dirs. sd_path_lookup() actually covers this nicely with SD_PATH_SEARCH_*, where the combined search paths (from user home and system) are used. Therefore, let's introduce a wrapper for that, and deprecate xdg_user_dirs() (would be removed in later commits).
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