Tests "V8Js::executeString" (2) is failing with V8 >= 5.3.337

```
PHP  7.0.8
V8   5.3.337 / 5.4.3
V8Js 1.3.0
```

```
FAILED TEST SUMMARY
---------------------------------------------------------------------
Test V8::executeString() : Forcing to arrays (argument passing) [tests/execute_flags_args.phpt]
Test V8::executeString() : Prototype with PHP callbacks [tests/object_prototype.phpt]
```
