Need a better prefix for function prototypes to avoid potential collisions

Found in Rode0days program fileS5, function pread, collision between function prototype typedef for external symbol `read` and the decompiled function.

```c
typedef ssize_t (*pread)(int s_0,void * s_1,size_t s_2);
pread z__read = NULL;
```
vs
```c
ssize_t  pread(int fd, void *buf, size_t nbytes, __off_t offset)
```