ffi: link to _PyPyBytes_Resize

[birkenfeld]

Fixes #2737

[darleybarreto]

When compiling for PyPy, _PyBytes_Resize wont be available, I think we could move the definition of this function out of cpython folder, like adding it here (or somewhere else in src/bytesobject.rs):

#[cfg_attr(windows, link(name = "pythonXY"))]
extern "C" {
    #[cfg_attr(PyPy, link_name = "PyPyBytes_Type")]
    pub static mut PyBytes_Type: PyTypeObject;
    pub static mut PyBytesIter_Type: PyTypeObject;
    #[cfg_attr(PyPy, link_name = "_PyPyBytes_Resize")]
    pub fn _PyBytes_Resize(bytes: *mut *mut PyObject, newsize: Py_ssize_t) -> c_int;
}

[birkenfeld]

Damn, I saw there were already PyPy conditionals in bytesobject.rs, so I didn't check. Removing the conditional inmod.rs seems to be the right course of action.

[birkenfeld]

See also #2758

[messense]

The CI failure on main is caused by oli-obk/cargo_metadata#212