[NETFILTER]: Use __u32 in struct nf_inet_addr

As reported by David Woodhouse <dwmw2@infradead.org>, using u_int32_t
in struct nf_inet_addr breaks the busybox build. Fix by using __u32.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netfilter.h

@@ -51,7 +51,7 @@ enum nf_inet_hooks {
 };
 
 union nf_inet_addr {
-	u_int32_t	all[4];
+	__u32		all[4];
 	__be32		ip;
 	__be32		ip6[4];
 	struct in_addr	in;