Replace usage of jaraco.collections.DictStack with collections.ChainMap

Author: Sachaa-Thanasius

distutils/command/install.py

@@ -4,6 +4,7 @@
 
 from __future__ import annotations
 
+import collections
 import contextlib
 import itertools
 import os
@@ -13,8 +14,6 @@
 from site import USER_BASE, USER_SITE
 from typing import ClassVar
 
-import jaraco.collections
-
 from ..core import Command
 from ..debug import DEBUG
 from ..errors import DistutilsOptionError, DistutilsPlatformError
@@ -432,12 +431,12 @@ def finalize_options(self) -> None:  # noqa: C901
             local_vars['userbase'] = self.install_userbase
             local_vars['usersite'] = self.install_usersite
 
-        self.config_vars = jaraco.collections.DictStack([
-            fw.vars(),
-            compat_vars,
-            sysconfig.get_config_vars(),
+        self.config_vars = collections.ChainMap(
             local_vars,
-        ])
+            sysconfig.get_config_vars(),
+            compat_vars,
+            fw.vars(),
+        )
 
         self.expand_basedirs()