Fix type lookup in the presence of using directives and using declarations

Fix some cases of type lookup failure via a combination of both using directives and
using declarations resulting in C++ code that did not compile as the generated type was
not fully qualified for use in the global namespace. Example below:

    namespace Space5 {
      namespace SubSpace5 {
        namespace SubSubSpace5 {
          struct F {};
        }
      }
      using namespace SubSpace5;
      using SubSubSpace5::F;
      void func(SubSubSpace5::F f);
    }

Examples/test-suite/common.mk

@@ -292,6 +292,7 @@ CPP_TEST_CASES += \
 	multiple_inheritance_shared_ptr \
 	name_cxx \
 	name_warnings \
+	namespace_chase \
 	namespace_class \
 	namespace_enum \
 	namespace_extend \