Don't include telemetry header unless telemetry is defined

All uses of this headers functions are already guarded behind that define. It has a surprising time cost due to std::vector.

Author: Aidan Lee

include/hx/Telemetry.h

@@ -3,7 +3,6 @@
 
 #define HX_TELEMETRY_VERSION 1
 
-#include <hxcpp.h>
 #include <vector>
 
 struct TelemetryFrame

include/hxcpp.h

@@ -346,7 +346,9 @@ typedef PropertyAccessMode PropertyAccess;
 #include <hx/Class.h>
 #include "Enum.h"
 #include <hx/Interface.h>
+#ifdef HXCPP_TELEMETRY
 #include <hx/Telemetry.h>
+#endif
 #if defined(__OBJC__) && defined(HXCPP_OBJC)
   #include <hx/ObjcHelpers.h>
 #endif