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

Eigen/src/misc/Solve.h

@@ -25,6 +25,8 @@
 #ifndef EIGEN_MISC_SOLVE_H
 #define EIGEN_MISC_SOLVE_H
 
+namespace Eigen { 
+
 namespace internal {
 
 /** \class solve_retval_base
@@ -84,4 +86,6 @@ template<typename _DecompositionType, typename Rhs> struct solve_retval_base
   solve_retval(const DecompositionType& dec, const Rhs& rhs) \
     : Base(dec, rhs) {}
 
+} // end namespace Eigen
+
 #endif // EIGEN_MISC_SOLVE_H