ROSE output for a struct return type is incorrect

@pinnown is already working on this.

Since Sep 8, 2020.

ROSE fails to output valid c for the following ```test.c``` program:
```
#include
#include

#ifndef PRIVATE
#define PRIVATE static
#endif

typedef struct num2 num2;

PRIVATE struct num1* add_struct(num2*);

typedef struct num1 num1;

struct num1 {
int y;
};

struct num2 {
num1* x;
};

PRIVATE num1* add_struct(num2* a) {
return a->x;
}

int main() {
// Test 3: Weird struct error?
num1* d = malloc(sizeof(num1));
num2* e = malloc(sizeof(num2));
d->y = 4;
e->x = d;
d = add_struct(e);
printf("D should be 4 and is: %d\n", d->y);

free(d);
free(e);
return 0;
}

```
The resulting ```rose_test.c``` file is
```
#include
#include
#ifndef PRIVATE
#define PRIVATE static
#endif
struct num2 ;
typedef struct num2 num2;
struct num1 ;
static num1 *add_struct(num2 *);
typedef struct num1 num1;

struct num1
{
int y;
}
;

struct num2
{
num1 *x;
}
;

static num1 *add_struct(num2 *a)
{
return a -> x;
}

int main()
{
// Test 3: Weird struct error?
num1 *d = (malloc(sizeof(num1 )));
num2 *e = (malloc(sizeof(num2 )));
d -> y = 4;
e -> x = d;
d = add_struct(e);
printf("D should be 4 and is: %d\n",d -> y);
free(d);
free(e);
return 0;
}
```
The error when attempting to compile ```rose_test.c``` with gcc is as follows:
```
$ gcc ../rose_bug1.c
../rose_bug1.c:9:8: error: unknown type name ‘num1’
static num1 *add_struct(num2 *);
^~~~
../rose_bug1.c:24:14: error: conflicting types for ‘add_struct’
static num1 *add_struct(num2 *a)
^~~~~~~~~~
../rose_bug1.c:9:14: note: previous declaration of ‘add_struct’ was here
static num1 *add_struct(num2 *);
^~~~~~~~~~
```
This output boils down to one line I believe ```static num1 *add_struct(num2 *);``` in ```rose_test.c``` as ROSE replaced the correct return value of ```struct num1 *``` in the original file with a return value of ```num1 *``` and the typedef does not occur until after. This however is valid c.