Fails to build on i386: error: incompatible function pointer types initializing 'hashfunc' (aka 'int (*)(struct _object *)') with an expression of type 'long (PyObject *)' (aka 'long (struct _object *)')

```
error: incompatible function pointer types initializing 'hashfunc' (aka 'int (*)(struct _object *)') with an expression of type 'long (PyObject *)' (aka 'long (struct _object *)')
```

Version: 0.1.13
FreeBSD 13.2
