- remove erroneously leaked in inclusion of non-existing l2tp thing

package/Config.in

@@ -131,7 +131,6 @@ source "package/hostap/Config.in"
 source "package/iproute2/Config.in"
 source "package/ipsec-tools/Config.in"
 source "package/iptables/Config.in"
-source "package/l2tp/Config.in"
 source "package/libcgi/Config.in"
 source "package/libcgicc/Config.in"
 source "package/libpcap/Config.in"