lwtunnel: export linux/lwtunnel.h to userspace

Note also that include/linux/lwtunnel.h is not needed.

CC: Thomas Graf <[email protected]>
CC: Roopa Prabhu <[email protected]>
Fixes: 499a242 ("lwtunnel: infrastructure for handling light weight tunnels like mpls")
Signed-off-by: Nicolas Dichtel <[email protected]>
Acked-by: Roopa Prabhu <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: NicolasDichtel

include/linux/lwtunnel.h

@@ -243,6 +243,7 @@ header-y += limits.h
 header-y += llc.h
 header-y += loop.h
 header-y += lp.h
+header-y += lwtunnel.h
 header-y += magic.h
 header-y += major.h
 header-y += map_to_7segment.h