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/vision/events/udp.h b/aos/vision/events/udp.h
index 503ead1..3c16b28 100644
--- a/aos/vision/events/udp.h
+++ b/aos/vision/events/udp.h
@@ -2,9 +2,10 @@
 #define AOS_VISION_EVENTS_UDP_H_
 
 #include <arpa/inet.h>
-#include <math.h>
 #include <sys/socket.h>
 #include <unistd.h>
+
+#include <cmath>
 #include <string>
 #include <vector>