[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/newobject2_runme.ml

@@ -0,0 +1,16 @@
+open Swig
+open Newobject2
+
+let _ =
+  assert (_fooCount '() as int = 0);
+  let foo1 = _makeFoo '() in
+  assert (_fooCount '() as int = 1);
+  assert (_do_stuff '(foo1) = C_void);
+  let foo2 = _makeFoo '() in
+  assert (_fooCount '() as int = 2);
+  assert (_do_stuff '(foo2) = C_void);
+  ignore (foo1 -> "~" ());
+  assert (_fooCount '() as int = 1);
+  ignore (foo2 -> "~" ());
+  assert (_fooCount '() as int = 0)
+;;