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/java/namespace_chase_runme.java

@@ -0,0 +1,26 @@
+
+import namespace_chase.*;
+
+public class namespace_chase_runme {
+
+  static {
+    try {
+      System.loadLibrary("namespace_chase");
+    } catch (UnsatisfiedLinkError e) {
+      System.err.println("Native code library failed to load. See the chapter on Dynamic Linking Problems in the SWIG Java documentation for help.\n" + e);
+      System.exit(1);
+    }
+  }
+
+  public static void main(String argv[]) 
+  {
+    Struct1A s1a = new Struct1A();
+    Struct1B s1b = new Struct1B();
+    Struct1C s1c = new Struct1C();
+
+    namespace_chase.sss3a(s1a, s1b, s1c);
+    namespace_chase.sss3b(s1a, s1b, s1c);
+    // needs fixing
+//    namespace_chase.sss3c(s1a, s1b, s1c);
+  }
+}