local.conf: enabled generation of build statistics
local.conf: optimize build space by removing temporary files
avahi: removed recipe append as SO_REUSEPORT problem fixed upstream

This append was introduced to workaround the SO_REUSEPORT problem
that has now been fixed upstream, see
https://github.com/openembedded/oe-core/commit/85e89da55f778ad3713460cb0df1435d82e94510