file-has-acl: symlinks can have scontext Problem reported by Pádraig Brady <https://bugs.gnu.org/73418#35>. * lib/file-has-acl.c (file_has_aclinfo): With SELinux, symbolic links can have security contexts, so omit incorrect optimizations assuming that they lack them. When ! (flags & AC_SYMLINK_FOLLOW), prefer acl_get_link_np to acl_get_file on platforms that have both APIs, as this can avoid some races.