fix datatype() declarations

Author: cosmicexplorer

src/python/pants/backend/native/register.py

@@ -11,7 +11,7 @@
 from pants.util.osutil import get_normalized_os_name
 
 
-class Platform(datatype('Platform', ['normalized_os_name'])):
+class Platform(datatype(['normalized_os_name'])):
 
   def __new__(cls):
     return super(Platform, cls).__new__(cls, get_normalized_os_name())

src/python/pants/backend/python/tasks/setup_py.py

@@ -79,9 +79,7 @@ def _setup_command(self):
     return self.__setup_command
 
 
-class SetupPyInvocationEnvironment(datatype('SetupPyInvocationEnvironment', [
-    'joined_path',
-])):
+class SetupPyInvocationEnvironment(datatype(['joined_path'])):
 
   def as_env_dict(self):
     return {