os.py: base class _Environ on dict instead of UserDict

[doko42]

BPO	1094387
Nosy	@loewis, @doko42
Files	udict.diff: patch for os.py

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2007-03-10.16:08:17.000>
created_at = <Date 2005-01-02.10:22:00.000>
labels = ['library']
title = 'os.py: base class _Environ on dict instead of UserDict'
updated_at = <Date 2007-03-10.16:08:17.000>
user = 'https://github.com/doko42'

bugs.python.org fields:

activity = <Date 2007-03-10.16:08:17.000>
actor = 'collinwinter'
assignee = 'none'
closed = True
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2005-01-02.10:22:00.000>
creator = 'doko'
dependencies = []
files = ['6409']
hgrepos = []
issue_num = 1094387
keywords = ['patch']
message_count = 3.0
messages = ['47446', '47447', '47448']
nosy_count = 3.0
nosy_names = ['loewis', 'collinwinter', 'doko']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue1094387'
versions = ['Python 2.5']

[doko42]

os.py doesn't have a note, that is has to stay
compatible with python2.2 and before. Use the builtin
dict class for handling the environment.

[loewis]

Logged In: YES
user_id=21627

The patch is currently outdated. However, I'm wondering what
the advantage of inheriting from dict is.

[collinwinter]

Patch bpo-1367711 does the same thing and is against a more recent checkout; closing.