TIPC_CONFIG_SERVICE ifdef added to tipc/netlink.c

Signed-off-by: Lokesh Mandvekar <lsm5@buffalo.edu>
TIPC_CONFIG_SERVICE ifdef added to tipc/port.c

Signed-off-by: Lokesh Mandvekar <lsm5@buffalo.edu>
TIPC_CONFIG define added to discover.c

Signed-off-by: Lokesh Mandvekar <lsm5@buffalo.edu>