bpo-36710: Add tstate parameter in import.c (GH-14218)

* Add 'tstate' parameter to many internal import.c functions.
* _PyImportZip_Init() now gets 'tstate' parameter rather than
  'interp'.
* Add 'interp' parameter to _PyState_ClearModules() and rename it
  to _PyInterpreterState_ClearModules().
* Move private _PyImport_FindBuiltin() to the internal C API; add
  'tstate' parameter to it.
* Remove private _PyImport_AddModuleObject() from the C API:
  use public PyImport_AddModuleObject() instead.
* Remove private _PyImport_FindExtensionObjectEx() from the C API:
  use private _PyImport_FindExtensionObject() instead.
diff --git a/Include/cpython/import.h b/Include/cpython/import.h
index 8dd7a0c..c1b4712 100644
--- a/Include/cpython/import.h
+++ b/Include/cpython/import.h
@@ -11,21 +11,14 @@
 PyAPI_FUNC(int) _PyImport_IsInitialized(PyInterpreterState *);
 
 PyAPI_FUNC(PyObject *) _PyImport_GetModuleId(struct _Py_Identifier *name);
-PyAPI_FUNC(PyObject *) _PyImport_AddModuleObject(PyObject *name,
-                                                 PyObject *modules);
 PyAPI_FUNC(int) _PyImport_SetModule(PyObject *name, PyObject *module);
 PyAPI_FUNC(int) _PyImport_SetModuleString(const char *name, PyObject* module);
 
 PyAPI_FUNC(void) _PyImport_AcquireLock(void);
 PyAPI_FUNC(int) _PyImport_ReleaseLock(void);
 
-PyAPI_FUNC(PyObject *) _PyImport_FindBuiltin(
-    const char *name,            /* UTF-8 encoded string */
-    PyObject *modules
-    );
 PyAPI_FUNC(PyObject *) _PyImport_FindExtensionObject(PyObject *, PyObject *);
-PyAPI_FUNC(PyObject *) _PyImport_FindExtensionObjectEx(PyObject *, PyObject *,
-                                                       PyObject *);
+
 PyAPI_FUNC(int) _PyImport_FixupBuiltin(
     PyObject *mod,
     const char *name,            /* UTF-8 encoded string */