exclude two more modules from stdlib compilation that require bootstrapping...

exclude two more modules from stdlib compilation that require bootstrapping before importing Cython modules

Tools/cystdlib.py

@@ -33,6 +33,8 @@ broken = [
     'traceback.py',
     'types.py',
     'enum.py',
+    'keyword.py',
+    '_collections_abc.py',
     'importlib/_bootstrap',
 ]