Test failure on windows (appveyor) with exit code (-1073741675)

This tests keeps failing intermittently on Windows (https://ci.appveyor.com/project/harendra-kumar/streamly/builds/37814315):

```
    Prelude.Async:  exited with: ExitFailure (-1073741675)
```

We should either figure out which particular test in this suite is failing and fix/disable that or disable the suite itself and keep it enabled in dev build.