include/uapi/linux/ip6_tunnel.h: include linux/if.h and linux/in6.h

Fixes userspace compile errors like:

error: ‘IFNAMSIZ’ undeclared here (not in a function)
error: field ‘laddr’ has incomplete type
  struct in6_addr laddr; /* local tunnel end-point address */

Signed-off-by: Mikko Rapeli <redacted>
---
 include/uapi/linux/ip6_tunnel.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/uapi/linux/ip6_tunnel.h b/include/uapi/linux/ip6_tunnel.h
index 48af63c..21cfd62 100644
--- a/include/uapi/linux/ip6_tunnel.h
+++ b/include/uapi/linux/ip6_tunnel.h

@@ -2,6 +2,8 @@
 #define _IP6_TUNNEL_H
 
 #include <linux/types.h>
+#include <linux/if.h>
+#include <linux/in6.h>
 
 #define IPV6_TLV_TNL_ENCAP_LIMIT 4
 #define IPV6_DEFAULT_TNL_ENCAP_LIMIT 4

-- 
2.5.0