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/y2016/vision/target_receiver.cc b/y2016/vision/target_receiver.cc
index cc9f41b..a762e4f 100644
--- a/y2016/vision/target_receiver.cc
+++ b/y2016/vision/target_receiver.cc
@@ -1,10 +1,10 @@
 #include <netdb.h>
-#include <stdlib.h>
 #include <unistd.h>
 
 #include <array>
 #include <atomic>
 #include <chrono>
+#include <cstdlib>
 #include <limits>
 #include <memory>
 #include <thread>