Update to kernel headers v4.12.3.

Test: Built angler.
Change-Id: Icbcf4fac2334de8409b049ed7a3b4c24b4e98ce9
diff --git a/libc/kernel/uapi/linux/if_bridge.h b/libc/kernel/uapi/linux/if_bridge.h
index 35c2acd..7e6a72f 100644
--- a/libc/kernel/uapi/linux/if_bridge.h
+++ b/libc/kernel/uapi/linux/if_bridge.h
@@ -105,6 +105,7 @@
   IFLA_BRIDGE_FLAGS,
   IFLA_BRIDGE_MODE,
   IFLA_BRIDGE_VLAN_INFO,
+  IFLA_BRIDGE_VLAN_TUNNEL_INFO,
   __IFLA_BRIDGE_MAX,
 };
 #define IFLA_BRIDGE_MAX (__IFLA_BRIDGE_MAX - 1)
@@ -118,6 +119,14 @@
   __u16 flags;
   __u16 vid;
 };
+enum {
+  IFLA_BRIDGE_VLAN_TUNNEL_UNSPEC,
+  IFLA_BRIDGE_VLAN_TUNNEL_ID,
+  IFLA_BRIDGE_VLAN_TUNNEL_VID,
+  IFLA_BRIDGE_VLAN_TUNNEL_FLAGS,
+  __IFLA_BRIDGE_VLAN_TUNNEL_MAX,
+};
+#define IFLA_BRIDGE_VLAN_TUNNEL_MAX (__IFLA_BRIDGE_VLAN_TUNNEL_MAX - 1)
 struct bridge_vlan_xstats {
   __u64 rx_bytes;
   __u64 rx_packets;