Fix integer negation and absolute value to not rely
on undefined behaviour of the C compiler anymore.
Will backport to 2.5 and 2.4.
diff --git a/Misc/NEWS b/Misc/NEWS
index 0001f9f..2fb0793 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,9 @@
Core and builtins
-----------------
+- Integer negation and absolute value were fixed to not rely
+ on undefined behaviour of the C compiler anymore.
+
- Bug #1566800: make sure that EnvironmentError can be called with any
number of arguments, as was the case in Python 2.4.