Update to kernel headers v4.12.3.

Test: Built angler.
Change-Id: Icbcf4fac2334de8409b049ed7a3b4c24b4e98ce9
diff --git a/libc/kernel/uapi/linux/nsfs.h b/libc/kernel/uapi/linux/nsfs.h
index 0a35074..d32d31c 100644
--- a/libc/kernel/uapi/linux/nsfs.h
+++ b/libc/kernel/uapi/linux/nsfs.h
@@ -22,4 +22,6 @@
 #define NSIO 0xb7
 #define NS_GET_USERNS _IO(NSIO, 0x1)
 #define NS_GET_PARENT _IO(NSIO, 0x2)
+#define NS_GET_NSTYPE _IO(NSIO, 0x3)
+#define NS_GET_OWNER_UID _IO(NSIO, 0x4)
 #endif