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/y2018/control_loops/superstructure/intake/intake.h b/y2018/control_loops/superstructure/intake/intake.h
index 7bc3986..09a7e4d 100644
--- a/y2018/control_loops/superstructure/intake/intake.h
+++ b/y2018/control_loops/superstructure/intake/intake.h
@@ -1,7 +1,7 @@
 #ifndef Y2018_CONTROL_LOOPS_SUPERSTRUCTURE_INTAKE_INTAKE_H_
 #define Y2018_CONTROL_LOOPS_SUPERSTRUCTURE_INTAKE_INTAKE_H_
 
-#include <math.h>
+#include <cmath>
 
 #include "aos/commonmath.h"
 #include "frc971/control_loops/control_loop.h"