ffi/ffi-swig-generator — pull request #34 by davispuh (2014-11-08 23:45:17+00:00)
Title: va_list for callbacks

```c
void fn(void (*cb)(const char*, va_list));
```

was still generated as
```ruby
attach_function :fn, :fn, [ callback([ :string, va_list ], :void) ], :void
```

this PR fixes it, but not sure if this is best way to implement it.