Change ALUT cffi:define-foreign-library

[azimut]

1. To not use a list on :default, seems like a typo.
2. Resort :unix bindings, from more to less specific. Same as the other bindings.

This is not just for consistency with other cffi:define-foreign-library declarations on this repo.

But I got into these 2 issues while using https://github.com/shinmera/deploy while making a bundle of my program which uses cl-openal and having the fix here seems to make more sense.