Made changes highlighted by code review,

Cython/Utils.py

@@ -147,16 +147,16 @@ def find_root_package_dir(file_path):
 
 
 @cached_function
-def check_package_dir(dir, package_names):
+def check_package_dir(dir_path, package_names):
     namespace = True
     for dirname in package_names:
-        dir = os.path.join(dir, dirname)
-        has_init = contains_init(dir)
+        dir_path = os.path.join(dir_path, dirname)
+        has_init = contains_init(dir_path)
         if not namespace and not has_init:
             return None, False
         elif has_init:
             namespace = False
-    return dir, namespace
+    return dir_path, namespace
 
 
 @cached_function
@@ -167,7 +167,6 @@ def contains_init(dir_path):
             return 1
 
 
-@cached_function
 def is_package_dir(dir_path):
     if contains_init(dir_path):
         return 1

runtests.py

@@ -428,6 +428,7 @@ VER_DEP_MODULES = {
                                         'run.special_methods_T561_py2',
                                         ]),
     (3,3) : (operator.lt, lambda x: x in ['build.package_compilation',
+                                          'build.cythonize_pep420_namespace',
                                           'run.yield_from_py33',
                                           'pyximport.pyximport_namespace',
                                           'run.qualname',