Include cmath instead of math.h in hip_complex.h

include/hip/hcc_detail/hip_complex.h

@@ -24,7 +24,7 @@ THE SOFTWARE.
 #define HIP_INCLUDE_HIP_HCC_DETAIL_HIP_COMPLEX_H
 
 #include "hip/hcc_detail/hip_vector_types.h"
-#include <math.h>
+#include <cmath>
 
 #if __cplusplus
 #define COMPLEX_ADD_OP_OVERLOAD(type)                                                              \