bpo-43268: Pass interp rather than tstate to internal functions (GH-24580)

Pass the current interpreter (interp) rather than the current Python
thread state (tstate) to internal functions which only use the
interpreter.

Modified functions:

* _PyXXX_Fini() and _PyXXX_ClearFreeList() functions
* _PyEval_SignalAsyncExc(), make_pending_calls()
* _PySys_GetObject(), sys_set_object(), sys_set_object_id(), sys_set_object_str()
* should_audit(), set_flags_from_config(), make_flags()
* _PyAtExit_Call()
* init_stdio_encoding()
* etc.
diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 8c4e6e5..dec2984 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -2853,11 +2853,11 @@ static struct PyModuleDef builtinsmodule = {
 
 
 PyObject *
-_PyBuiltin_Init(PyThreadState *tstate)
+_PyBuiltin_Init(PyInterpreterState *interp)
 {
     PyObject *mod, *dict, *debug;
 
-    const PyConfig *config = _PyInterpreterState_GetConfig(tstate->interp);
+    const PyConfig *config = _PyInterpreterState_GetConfig(interp);
 
     if (PyType_Ready(&PyFilter_Type) < 0 ||
         PyType_Ready(&PyMap_Type) < 0 ||