diff mercurial/cext/osutil.c @ 46374:e92ca942ddca

cext: add Python 3.10 support

* Replace "Py_TYPE(obj) = type;" with "Py_SET_TYPE(obj, type);"
* Add pythoncapi_compat.h header file to get Py_SET_TYPE() on Python
  2.7-3.8. Header file added to mercurial/ and
  contrib/python-zstandard/zstd/common/.

In Python 3.10, Py_TYPE(obj) must not longer be used as an l-value.

pythoncapi_compat.h comes from:
https://github.com/pythoncapi/pythoncapi_compat

Differential Revision: https://phab.mercurial-scm.org/D9825

--- a/mercurial/cext/osutil.c	Wed Jan 20 14:47:13 2021 +0100
+++ b/mercurial/cext/osutil.c	Mon Dec 14 10:44:29 2020 +0100
@@ -119,7 +119,7 @@
 
 static void listdir_stat_dealloc(PyObject *o)
 {
-	o->ob_type->tp_free(o);
+	Py_TYPE(o)->tp_free(o);
 }
 
 static PyObject *listdir_stat_getitem(PyObject *self, PyObject *key)