macro used in struct declaration not translated properly

C code:

```c
#define __FSID_T_TYPE struct { int __val[2]; }
typedef  __FSID_T_TYPE __fsid_t;
typedef __fsid_t fsid_t;
```

Right now produces this:

```d
extern (C):
 
struct __fsid_t
{
    int[__FSID_T_TYPE] __val;
}
 
alias fsid_t = __fsid_t;
```

The correct code would be:

```d
extern (C):

struct __fsid_t
{
    int[2] __val;
}

alias fsid_t = __fsid_t;
```