2to3 munges new lines on Windows

[jaraco]

BPO	34108
Nosy	@jaraco
PRs	bpo-34108: Fix double carriage return in 2to3 on Windows #8271 [3.7] bpo-34108: Fix double carriage return in 2to3 on Windows (GH-8271) #8275

^{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 = 'https://github.com/jaraco'
closed_at = <Date 2018-07-13.19:25:33.705>
created_at = <Date 2018-07-13.12:31:21.196>
labels = ['3.8', 'type-bug', '3.7']
title = '2to3 munges new lines on Windows'
updated_at = <Date 2018-07-13.19:25:33.704>
user = 'https://github.com/jaraco'

bugs.python.org fields:

activity = <Date 2018-07-13.19:25:33.704>
actor = 'jaraco'
assignee = 'jaraco'
closed = True
closed_date = <Date 2018-07-13.19:25:33.705>
closer = 'jaraco'
components = []
creation = <Date 2018-07-13.12:31:21.196>
creator = 'jaraco'
dependencies = []
files = []
hgrepos = []
issue_num = 34108
keywords = ['patch', '3.7regression']
message_count = 4.0
messages = ['321599', '321615', '321619', '321629']
nosy_count = 1.0
nosy_names = ['jaraco']
pr_nums = ['8271', '8275']
priority = 'high'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue34108'
versions = ['Python 3.7', 'Python 3.8']

[jaraco]

In bpo-11594, we attempted to solve the newlines issue but inadvertently introduced extraneous CR before CRLF newlines when running on Windows. See #6483 (comment) for more details.

[jaraco]

The regression never got to 3.6, so this issue likely only affects 3.7+.

[jaraco]

New changeset cafaf04 by Jason R. Coombs in branch 'master':
bpo-34108: Fix double carriage return in 2to3 on Windows (bpo-8271)
cafaf04

[jaraco]

New changeset cf21d00 by Jason R. Coombs (Miss Islington (bot)) in branch '3.7':
bpo-34108: Fix double carriage return in 2to3 on Windows (GH-8271) (bpo-8275)
cf21d00