Auto merge of #597 - servo:void-vtable, r=fitzgen,emilio

Make vtables non-zero-size to fix a rustc warning.

```
warning: found non-foreign-function-safe member in struct marked #[repr(C)]: found zero-size struct in foreign module, consider adding a member to this struct
```

Emilio said on IRC:
> the empty vtable means that we don't care of figuring out the proper vtable layout, so we create an empty struct

Sounds like all that matters is to have a pointer, we don’t look at the data behind it. Using `c_void` seems appropriate, then.

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