Replace use of deprecated C Standard library headers in C++ code.

Change-Id: I9fa6630c7e4bdb2897df34d417635d8c7d8253bc
Signed-off-by: Tyler Chatow <tchatow@gmail.com>
diff --git a/aos/ipc_lib/lockless_queue_test.cc b/aos/ipc_lib/lockless_queue_test.cc
index 57867e4..2b9f49c 100644
--- a/aos/ipc_lib/lockless_queue_test.cc
+++ b/aos/ipc_lib/lockless_queue_test.cc
@@ -1,11 +1,11 @@
 #include "aos/ipc_lib/lockless_queue.h"
 
-#include <inttypes.h>
-#include <signal.h>
 #include <unistd.h>
 #include <wait.h>
 
 #include <chrono>
+#include <cinttypes>
+#include <csignal>
 #include <memory>
 #include <random>
 #include <thread>