Get rid of borrows from Objects/tupleobject.c

Summary:
Add a PyAPI declaration to the functions we need and remove the borrows from
them and their dependencies.

Reviewed By: DinoV

Differential Revision: D65365902

fbshipit-source-id: 49c01edaf36a0fd01ac1458d14c1f0d664286a01

Include/internal/pycore_tuple.h

@@ -63,7 +63,7 @@ struct _Py_tuple_state {
 
 #define _PyTuple_ITEMS(op) _Py_RVALUE(_PyTuple_CAST(op)->ob_item)
 
-extern PyObject *_PyTuple_FromArray(PyObject *const *, Py_ssize_t);
+PyAPI_FUNC(PyObject *) _PyTuple_FromArray(PyObject *const *, Py_ssize_t);
 PyAPI_FUNC(PyObject *) _PyTuple_FromArraySteal(PyObject *const *, Py_ssize_t);