avahi: unset FILES_avahi to avoid packaging files there
The main avahi recipe doesn't package anything into ${PN}. If a library is
enabled but not put into a separate package it ends up in ${PN} and all the
packages are renamed using it's soname - ie libdns-sd-daemon.
Avoid this by clearing FILES_avahi so extra files are unpackaged instead of
creating a new package. Also actually remove /var as the comments claim so the
avahi package is truly empty.
Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
