[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/li_cpointer_cpp_runme.ml

@@ -0,0 +1,10 @@
+open Swig
+open Li_cpointer_cpp
+
+let _ =
+  let p = _new_intp '() in
+  assert (_intp_value '(p) as int = 0);
+  assert (_intp_assign '(p, 3) = C_void);
+  assert (_intp_value '(p) as int = 3);
+  assert (_delete_intp '(p) = C_void)
+;;