force the creation of users "well-known" directories. Since we don't use
things like /etc/X11/xinit/xinitrc.d/foo.sh, using an autostart file is
the closest we can get to how upstream advises it to be used.
xdg-user-dirs is a tool to help manage "well known" user directories
like the desktop folder and the music folder. It also handles
localization (i.e. translation) of the filenames.
adapted from FreeBSD port
