[TIPC]: Add tipc_config.h to include/linux/Kbuild.

Needed, as reported in:

http://bugzilla.kernel.org/show_bug.cgi?id=9260

Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/Kbuild

@@ -149,6 +149,7 @@ header-y += ticable.h
 header-y += times.h
 header-y += tiocl.h
 header-y += tipc.h
+header-y += tipc_config.h
 header-y += toshiba.h
 header-y += ultrasound.h
 header-y += un.h