bpo-34569: Fix subinterpreter 32-bit  ABI, pystate.c/_new_long_object() (gh-9127)

This fixes ShareableTypeTests.test_int() in Lib/test/test__xxsubinterpreters.py.
diff --git a/Python/pystate.c b/Python/pystate.c
index 98882eb..4dc3b81 100644
--- a/Python/pystate.c
+++ b/Python/pystate.c
@@ -1467,7 +1467,7 @@
 static PyObject *
 _new_long_object(_PyCrossInterpreterData *data)
 {
-    return PyLong_FromLongLong((int64_t)(data->data));
+    return PyLong_FromLongLong((intptr_t)(data->data));
 }
 
 static int