`intptr` handling
My system headers define a type called __intptr_t, causing troubles:

```
ico@platdoos:~/external/nimterop(master)$ cat t.h 
typedef long int __intptr_t;
ico@platdoos:~/external/nimterop(master)$ ./toast -n t.h
{.experimental: "codeReordering".}
const
  headert = "t.h"

type
  ptr int* = clong
```