[OCaml] Runtime tests for fvirtual, overload_polymorphic and some others

Add runtime tests for conversion, extend_typedef_class,
extend_constructor_destructor, fvirtual, overload_polymorphic,
template_rename, and using1.

Examples/test-suite/ocaml/template_rename_runme.ml

@@ -0,0 +1,12 @@
+open Swig
+open Template_rename
+
+let _ =
+  let i = new_iFoo '() and d = new_dFoo '() in
+  assert (i -> blah_test (4) as int = 4);
+  assert (i -> spam_test (5) as int = 5);
+  assert (i -> groki_test (6) as int = 6);
+  assert (d -> blah_test (7) as int = 7);
+  assert (d -> spam (8) as int = 8);
+  assert (d -> grok_test (9) as int = 9)
+;;