Fix a reference leak found by Georg, when compiling a class nested in another class.
Now "regrtest.py -R:: test_compile" is satisfied.
Will backport.
diff --git a/Misc/NEWS b/Misc/NEWS
index 7c413d6..893b8ac 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,9 @@
Core and builtins
-----------------
+- The compilation of a class nested in another class used to leak one
+ reference on the outer class name.
+
- Patch #1810: compile() can now compile _ast trees as returned by
compile(..., PyCF_ONLY_AST).