Added support of module-based unit tests for `utility`.

* test/unit/jamfile: Added dependency on unit tests of `utility`.
* test/unit/utility/jamfile: Removed `compile`, `compile-fail`, `run` and
  `run-fail` targets.
* test/unit/utility/as_const_run.cpp: Added test suites.
* test/unit/utility/simple_auto_forward_return_run.cpp: Added test suites.