Update kernel headers to v3.18.3.

Bug: 19127803
Change-Id: I67fa0832322ddd0032d909476047578be052bcf2
diff --git a/libc/kernel/uapi/linux/in6.h b/libc/kernel/uapi/linux/in6.h
index 8dd53c1..d97d58f 100644
--- a/libc/kernel/uapi/linux/in6.h
+++ b/libc/kernel/uapi/linux/in6.h
@@ -191,20 +191,21 @@
 #define IPV6_RECVTCLASS 66
 #define IPV6_TCLASS 67
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define IPV6_AUTOFLOWLABEL 70
 #define IPV6_ADDR_PREFERENCES 72
 #define IPV6_PREFER_SRC_TMP 0x0001
 #define IPV6_PREFER_SRC_PUBLIC 0x0002
-#define IPV6_PREFER_SRC_PUBTMP_DEFAULT 0x0100
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define IPV6_PREFER_SRC_PUBTMP_DEFAULT 0x0100
 #define IPV6_PREFER_SRC_COA 0x0004
 #define IPV6_PREFER_SRC_HOME 0x0400
 #define IPV6_PREFER_SRC_CGA 0x0008
-#define IPV6_PREFER_SRC_NONCGA 0x0800
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define IPV6_PREFER_SRC_NONCGA 0x0800
 #define IPV6_MINHOPCOUNT 73
 #define IPV6_ORIGDSTADDR 74
 #define IPV6_RECVORIGDSTADDR IPV6_ORIGDSTADDR
-#define IPV6_TRANSPARENT 75
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define IPV6_TRANSPARENT 75
 #define IPV6_UNICAST_IF 76
 #endif