Update to kernel headers v4.12.3.

Test: Built angler.
Change-Id: Icbcf4fac2334de8409b049ed7a3b4c24b4e98ce9
diff --git a/libc/kernel/uapi/asm-generic/socket.h b/libc/kernel/uapi/asm-generic/socket.h
index 2113896..d1dc0099 100644
--- a/libc/kernel/uapi/asm-generic/socket.h
+++ b/libc/kernel/uapi/asm-generic/socket.h
@@ -82,4 +82,7 @@
 #define SO_ATTACH_REUSEPORT_EBPF 52
 #define SO_CNX_ADVICE 53
 #define SCM_TIMESTAMPING_OPT_STATS 54
+#define SO_MEMINFO 55
+#define SO_INCOMING_NAPI_ID 56
+#define SO_COOKIE 57
 #endif