Update to kernel headers v4.12.3.

Test: Built angler.
Change-Id: Icbcf4fac2334de8409b049ed7a3b4c24b4e98ce9
diff --git a/libc/kernel/uapi/asm-x86/asm/unistd_64.h b/libc/kernel/uapi/asm-x86/asm/unistd_64.h
index c386eaf..3cde166 100644
--- a/libc/kernel/uapi/asm-x86/asm/unistd_64.h
+++ b/libc/kernel/uapi/asm-x86/asm/unistd_64.h
@@ -350,4 +350,5 @@
 #define __NR_pkey_mprotect 329
 #define __NR_pkey_alloc 330
 #define __NR_pkey_free 331
+#define __NR_statx 332
 #endif