Fixed virtual inheritance handling

tests/t00002/t00002.cc

@@ -58,12 +58,7 @@ private:
     std::vector<A *> as;
 };
 
-//
-// NOTE: libclang fails on:
-//
-//   class D : public virtual B, public virtual C {
-//
-class E : virtual public B, virtual public C {
+class E : virtual public B, public virtual C {
 public:
     ///
     /// Forward foo_a

tests/t00039/t00039.cc

@@ -38,7 +38,7 @@ struct AAA : public AA {
 };
 
 namespace ns2 {
-struct AAAA : public AAA {
+struct AAAA : public virtual AAA {
 };
 } // namespace ns2