changed reinterpret_cast to static_cast

This issue seem to be lingering around for quite some time
https://github.com/Itseez/opencv/pull/639
http://code.opencv.org/issues/2819

modules/core/include/opencv2/core/operations.hpp

@@ -686,7 +686,7 @@ template<typename _Tp> static inline
 Scalar operator * (const Matx<_Tp, 4, 4>& a, const Scalar& b)
 {
     Matx<double, 4, 1> c(Matx<double, 4, 4>(a), b, Matx_MatMulOp());
-    return reinterpret_cast<const Scalar&>(c);
+    return static_cast<const Scalar&>(c);
 }
 
 
@@ -694,7 +694,7 @@ static inline
 Scalar operator * (const Matx<double, 4, 4>& a, const Scalar& b)
 {
     Matx<double, 4, 1> c(a, b, Matx_MatMulOp());
-    return reinterpret_cast<const Scalar&>(c);
+    return static_cast<const Scalar&>(c);
 }