- do not override _sysconfdir. According to XDG Base Directory Specification 6
default xdg basedir is /etc/xdg, not /etc/X11/xdg. Moreover, awesome build
with -DSYSCONFDIR=/etc/X11 still searches for its configuration in
/etc/xdg/awesome.
- do not provide /etc/xdg directory
- mark config files as %config (this package is called example-config, but in
fact it is default system-wide awesome configuration, wich is used unles
overriden by user)