systemd version 212 removed the TCP wrappers support, so remove the
PACKAGECONFIG stanza for it.
(From OE-Core rev: 2e7ce6b537035bfac6742214b3b2f987963fba3c)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>