Remove AtheOS support, as per PEP 11 (which claims that all code was removed in Python 3.0).
diff --git a/Lib/test/test_file.py b/Lib/test/test_file.py
index bd2d7c0..fa867e0 100644
--- a/Lib/test/test_file.py
+++ b/Lib/test/test_file.py
@@ -106,8 +106,7 @@
                    ('writelines', ([],)),
                    ('__iter__', ()),
                    ]
-        if not sys.platform.startswith('atheos'):
-            methods.append(('truncate', ()))
+        methods.append(('truncate', ()))
 
         # __exit__ should close the file
         self.f.__exit__(None, None, None)