net: use __packed annotation

cleanup patch.

Use new __packed annotation in net/ and include/
(except netfilter)

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/if_ether.h b/include/linux/if_ether.h
index bed7a46..c831467 100644
--- a/include/linux/if_ether.h
+++ b/include/linux/if_ether.h
@@ -119,7 +119,7 @@
 	unsigned char	h_dest[ETH_ALEN];	/* destination eth addr	*/
 	unsigned char	h_source[ETH_ALEN];	/* source ether addr	*/
 	__be16		h_proto;		/* packet type ID field	*/
-} __attribute__((packed));
+} __packed;
 
 #ifdef __KERNEL__
 #include <linux/skbuff.h>