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

Eigen/src/Geometry/Homogeneous.h

@@ -25,6 +25,8 @@
 #ifndef EIGEN_HOMOGENEOUS_H
 #define EIGEN_HOMOGENEOUS_H
 
+namespace Eigen { 
+
 /** \geometry_module \ingroup Geometry_Module
   *
   * \class Homogeneous
@@ -315,4 +317,6 @@ struct homogeneous_right_product_impl<Homogeneous<MatrixType,Horizontal>,Rhs>
 
 } // end namespace internal
 
+} // end namespace Eigen
+
 #endif // EIGEN_HOMOGENEOUS_H