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/starter/starter_test.cc b/aos/starter/starter_test.cc
index fafeb77..dea27e9 100644
--- a/aos/starter/starter_test.cc
+++ b/aos/starter/starter_test.cc
@@ -1,5 +1,4 @@
-#include <signal.h>
-
+#include <csignal>
 #include <future>
 #include <thread>
 
diff --git a/aos/starter/starterd_lib.h b/aos/starter/starterd_lib.h
index 36109a9..38a11d6 100644
--- a/aos/starter/starterd_lib.h
+++ b/aos/starter/starterd_lib.h
@@ -1,11 +1,11 @@
 #ifndef AOS_STARTER_STARTERD_LIB_H_
 #define AOS_STARTER_STARTERD_LIB_H_
 
-#include <signal.h>
-#include <stdio.h>
 #include <sys/signalfd.h>
 #include <sys/wait.h>
 
+#include <csignal>
+#include <cstdio>
 #include <string>
 #include <unordered_map>
 #include <vector>