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.h b/aos/ipc_lib/lockless_queue.h
index b0fc425..d6fb72f 100644
--- a/aos/ipc_lib/lockless_queue.h
+++ b/aos/ipc_lib/lockless_queue.h
@@ -1,14 +1,14 @@
 #ifndef AOS_IPC_LIB_LOCKLESS_QUEUE_H_
 #define AOS_IPC_LIB_LOCKLESS_QUEUE_H_
 
-#include <signal.h>
 #include <sys/signalfd.h>
 #include <sys/types.h>
+
+#include <csignal>
 #include <optional>
 #include <vector>
 
 #include "absl/types/span.h"
-
 #include "aos/ipc_lib/aos_sync.h"
 #include "aos/ipc_lib/data_alignment.h"
 #include "aos/ipc_lib/index.h"