Get rid of include directives inside namespace blocks (bug #339).

Eigen/src/Core/VectorwiseOp.h

@@ -26,6 +26,8 @@
 #ifndef EIGEN_PARTIAL_REDUX_H
 #define EIGEN_PARTIAL_REDUX_H
 
+namespace Eigen { 
+
 /** \class PartialReduxExpr
   * \ingroup Core_Module
   *
@@ -606,4 +608,6 @@ DenseBase<Derived>::rowwise()
   return derived();
 }
 
+} // end namespace Eigen
+
 #endif // EIGEN_PARTIAL_REDUX_H