Update to kernel headers v5.3.2.

Test: Builds and run unit tests on taimen/cuttlefish.
Change-Id: I6ebd8f179d159ac974555e8edca588083e8081b3
diff --git a/libc/kernel/uapi/asm-generic/unistd.h b/libc/kernel/uapi/asm-generic/unistd.h
index 73520e1..2128ff5 100644
--- a/libc/kernel/uapi/asm-generic/unistd.h
+++ b/libc/kernel/uapi/asm-generic/unistd.h
@@ -392,8 +392,12 @@
 #define __NR_fsconfig 431
 #define __NR_fsmount 432
 #define __NR_fspick 433
+#define __NR_pidfd_open 434
+#ifdef __ARCH_WANT_SYS_CLONE3
+#define __NR_clone3 435
+#endif
 #undef __NR_syscalls
-#define __NR_syscalls 434
+#define __NR_syscalls 436
 #if __BITS_PER_LONG == 64 && !defined(__SYSCALL_COMPAT)
 #define __NR_fcntl __NR3264_fcntl
 #define __NR_statfs __NR3264_statfs