Improve macro defined constants to recognize #define CONSTANT ((int) 1)

In the header files I am trying to make bindings for, some constants are defined like this:

```c
#define kOfxStatFailed  ((int)1)
#define kOfxStatErrFatal ((int)2)
// ...
```

Can this pattern be supported? Maybe I can attempt to add this if I get some guidance :)
