Upgrade to tcpdump 4.7.4.

Bug: http://b/24902618
Change-Id: I7c3605015d90453b0a8c339b1774e285796f8775
diff --git a/ah.h b/ah.h
index c22806a..d87a087 100644
--- a/ah.h
+++ b/ah.h
@@ -38,19 +38,19 @@
 #define _NETINET6_AH_H_
 
 struct ah {
-	u_int8_t	ah_nxt;		/* Next Header */
-	u_int8_t	ah_len;		/* Length of data, in 32bit */
-	u_int16_t	ah_reserve;	/* Reserved for future use */
-	u_int32_t	ah_spi;		/* Security parameter index */
+	uint8_t		ah_nxt;		/* Next Header */
+	uint8_t		ah_len;		/* Length of data, in 32bit */
+	uint16_t	ah_reserve;	/* Reserved for future use */
+	uint32_t	ah_spi;		/* Security parameter index */
 	/* variable size, 32bit bound*/	/* Authentication data */
 };
 
 struct newah {
-	u_int8_t	ah_nxt;		/* Next Header */
-	u_int8_t	ah_len;		/* Length of data + 1, in 32bit */
-	u_int16_t	ah_reserve;	/* Reserved for future use */
-	u_int32_t	ah_spi;		/* Security parameter index */
-	u_int32_t	ah_seq;		/* Sequence number field */
+	uint8_t		ah_nxt;		/* Next Header */
+	uint8_t		ah_len;		/* Length of data + 1, in 32bit */
+	uint16_t	ah_reserve;	/* Reserved for future use */
+	uint32_t	ah_spi;		/* Security parameter index */
+	uint32_t	ah_seq;		/* Sequence number field */
 	/* variable size, 32bit bound*/	/* Authentication data */
 };