Avoid in6_addr redefinition

in6_addr is defined both in <linux/in6.h> and in <netinet/in.h>
therefore in6_addr is being redefined. Remove the include <linux/in6.h>
from <linux/if_bridge.h>

include/uapi/linux/if_bridge.h

@@ -16,7 +16,6 @@
 
 #include <linux/types.h>
 #include <linux/if_ether.h>
-#include <linux/in6.h>
 
 #define SYSFS_BRIDGE_ATTR	"bridge"
 #define SYSFS_BRIDGE_FDB	"brforward"
@@ -694,26 +693,6 @@ struct br_port_msg {
 	__u32 ifindex;
 };
 
-struct br_mdb_entry {
-	__u32 ifindex;
-#define MDB_TEMPORARY 0
-#define MDB_PERMANENT 1
-	__u8 state;
-#define MDB_FLAGS_OFFLOAD	(1 << 0)
-#define MDB_FLAGS_FAST_LEAVE	(1 << 1)
-#define MDB_FLAGS_STAR_EXCL	(1 << 2)
-#define MDB_FLAGS_BLOCKED	(1 << 3)
-	__u8 flags;
-	__u16 vid;
-	struct {
-		union {
-			__be32	ip4;
-			struct in6_addr ip6;
-		} u;
-		__be16		proto;
-	} addr;
-};
-
 enum {
 	MDBA_SET_ENTRY_UNSPEC,
 	MDBA_SET_ENTRY,