[OCaml] Runtime tests for inctest, li_cpointer_cpp and some others

Add runtime tests for inctest, li_cpointer_cpp, newobject2,
special_variables, special_variable_macros, template_extend1, and
template_extend2.

Examples/test-suite/ocaml/template_extend2_runme.ml

@@ -0,0 +1,8 @@
+open Swig
+open Template_extend2
+
+let _ =
+  let a = new_lBaz '() and b = new_dBaz '() in
+  assert (a -> foo () as string = "lBaz::foo");
+  assert (b -> foo () as string = "dBaz::foo")
+;;