Update to kernel headers v4.12.3.

Test: Built angler.
Change-Id: Icbcf4fac2334de8409b049ed7a3b4c24b4e98ce9
diff --git a/libc/kernel/uapi/linux/tcp.h b/libc/kernel/uapi/linux/tcp.h
index c388761..9c3a90d 100644
--- a/libc/kernel/uapi/linux/tcp.h
+++ b/libc/kernel/uapi/linux/tcp.h
@@ -84,6 +84,7 @@
 #define TCP_SAVE_SYN 27
 #define TCP_SAVED_SYN 28
 #define TCP_REPAIR_WINDOW 29
+#define TCP_FASTOPEN_CONNECT 30
 struct tcp_repair_opt {
   __u32 opt_code;
   __u32 opt_val;
@@ -172,6 +173,8 @@
   TCP_NLA_BUSY,
   TCP_NLA_RWND_LIMITED,
   TCP_NLA_SNDBUF_LIMITED,
+  TCP_NLA_DATA_SEGS_OUT,
+  TCP_NLA_TOTAL_RETRANS,
 };
 #define TCP_MD5SIG_MAXKEYLEN 80
 struct tcp_md5sig {