tests/datawizard/interfaces/vector/test_vector_interface.c: add missing include

tests/datawizard/interfaces/vector/test_vector_interface.c

@@ -15,6 +15,7 @@
  */
 #include <starpu.h>
 #include "../test_interfaces.h"
+#include "../../../common/helper.h"
 
 /* Prototypes */
 static void register_data(void);