Update to kernel headers v5.3.2.

Test: Builds and run unit tests on taimen/cuttlefish.
Change-Id: I6ebd8f179d159ac974555e8edca588083e8081b3
diff --git a/libc/include/bits/glibc-syscalls.h b/libc/include/bits/glibc-syscalls.h
index 6b3e347..aabcaab 100644
--- a/libc/include/bits/glibc-syscalls.h
+++ b/libc/include/bits/glibc-syscalls.h
@@ -114,6 +114,9 @@
 #if defined(__NR_clone)
   #define SYS_clone __NR_clone
 #endif
+#if defined(__NR_clone3)
+  #define SYS_clone3 __NR_clone3
+#endif
 #if defined(__NR_close)
   #define SYS_close __NR_close
 #endif
@@ -717,6 +720,9 @@
 #if defined(__NR_personality)
   #define SYS_personality __NR_personality
 #endif
+#if defined(__NR_pidfd_open)
+  #define SYS_pidfd_open __NR_pidfd_open
+#endif
 #if defined(__NR_pidfd_send_signal)
   #define SYS_pidfd_send_signal __NR_pidfd_send_signal
 #endif