Add reference implementation for PEP 443
PEP accepted: http://mail.python.org/pipermail/python-dev/2013-June/126734.html
diff --git a/Modules/Setup.dist b/Modules/Setup.dist
index 8ea2b5e..d4e1fe1 100644
--- a/Modules/Setup.dist
+++ b/Modules/Setup.dist
@@ -116,6 +116,7 @@
_operator _operator.c # operator.add() and similar goodies
_collections _collectionsmodule.c # Container types
itertools itertoolsmodule.c # Functions creating iterators for efficient looping
+atexit atexitmodule.c # Register functions to be run at interpreter-shutdown
# access to ISO C locale support
_locale _localemodule.c # -lintl
@@ -170,7 +171,6 @@
#_weakref _weakref.c # basic weak reference support
#_testcapi _testcapimodule.c # Python C API test module
#_random _randommodule.c # Random number generator
-#atexit atexitmodule.c # Register functions to be run at interpreter-shutdown
#_elementtree -I$(srcdir)/Modules/expat -DHAVE_EXPAT_CONFIG_H -DUSE_PYEXPAT_CAPI _elementtree.c # elementtree accelerator
#_pickle _pickle.c # pickle accelerator
#_datetime _datetimemodule.c # datetime accelerator