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

Eigen/src/SparseCore/SparseDot.h

@@ -25,6 +25,8 @@
 #ifndef EIGEN_SPARSE_DOT_H
 #define EIGEN_SPARSE_DOT_H
 
+namespace Eigen { 
+
 template<typename Derived>
 template<typename OtherDerived>
 typename internal::traits<Derived>::Scalar
@@ -102,4 +104,6 @@ SparseMatrixBase<Derived>::norm() const
   return internal::sqrt(squaredNorm());
 }
 
+} // end namespace Eigen
+
 #endif // EIGEN_SPARSE_DOT_H