[FIX] P3: list -> iterable builtins (#16811)

In Python 3:

* various builtins and dict methods were changed to return
  view/iterable objects rather than lists
* and the separate Python 2 view/iterable builtins and methods were
  removed altogether

This is problematic when using these items as list (which the happens
repeatedly in Odoo), but more viciously when iterating *multiple times*
over them (which also happens, which I've messed up multiple times while
writing this, and which is a pain to debug even when you've just created
the issue).

Convert all code using these to semantics-matching cross-version
helper functions to get the LCD behaviour between P2 and P3, and
forbid the builtins via lint.

issue #8530

setup.py

@@ -24,9 +24,9 @@ def py2exe_datafiles():
     import babel
     data_files['babel/localedata'] = glob(join(dirname(babel.__file__), 'localedata', '*'))
     others = ['global.dat', 'numbers.py', 'support.py', 'plural.py']
-    data_files['babel'] = map(lambda f: join(dirname(babel.__file__), f), others)
+    data_files['babel'] = [join(dirname(babel.__file__), f) for f in others]
     others = ['frontend.py', 'mofile.py']
-    data_files['babel/messages'] = map(lambda f: join(dirname(babel.__file__), 'messages', f), others)
+    data_files['babel/messages'] = [join(dirname(babel.__file__), 'messages', f) for f in others]
 
     import pytz
     tzdir = dirname(pytz.__file__)
@@ -51,7 +51,7 @@ def py2exe_datafiles():
                                 for f in filenames
                                 if not f.endswith(('.py', '.pyc', '.pyo'))]
 
-    return data_files.items()
+    return list(data_files.items())
 
 
 def py2exe_options():
@@ -128,7 +128,7 @@ setup(
     url=url,
     author=author,
     author_email=author_email,
-    classifiers=filter(None, classifiers.split('\n')),
+    classifiers=[c for c in classifiers.split('\n') if c],
     license=license,
     scripts=['setup/odoo'],
     packages=find_packages(),