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/queue_racer.cc b/aos/ipc_lib/queue_racer.cc
index d14a638..b738805 100644
--- a/aos/ipc_lib/queue_racer.cc
+++ b/aos/ipc_lib/queue_racer.cc
@@ -1,8 +1,7 @@
 #include "aos/ipc_lib/queue_racer.h"
 
-#include <inttypes.h>
-#include <string.h>
-
+#include <cinttypes>
+#include <cstring>
 #include <limits>
 
 #include "aos/ipc_lib/event.h"