Cleanup _overlapped module

[asvetlov]

BPO	47003
Nosy	@asvetlov, @1st1
PRs	bpo-47003: Cleanup _overlapped module #31848

^{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 2022-03-13.21:28:59.328>
created_at = <Date 2022-03-13.17:44:24.829>
labels = ['3.11', 'expert-asyncio']
title = 'Cleanup _overlapped module'
updated_at = <Date 2022-03-13.21:29:04.818>
user = 'https://github.com/asvetlov'

bugs.python.org fields:

activity = <Date 2022-03-13.21:29:04.818>
actor = 'asvetlov'
assignee = 'none'
closed = True
closed_date = <Date 2022-03-13.21:28:59.328>
closer = 'asvetlov'
components = ['asyncio']
creation = <Date 2022-03-13.17:44:24.829>
creator = 'asvetlov'
dependencies = []
files = []
hgrepos = []
issue_num = 47003
keywords = ['patch']
message_count = 2.0
messages = ['415064', '415103']
nosy_count = 2.0
nosy_names = ['asvetlov', 'yselivanov']
pr_nums = ['31848']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue47003'
versions = ['Python 3.11']

[asvetlov]

1. CancelIoEx is mandatory for supported Windows versions, there is no need for dynamic checks.
2. Argument Clinic supports Py_buffer, use it.

[asvetlov]

New changeset 690490e by Andrew Svetlov in branch 'main':
bpo-47003: Cleanup _overlapped module (GH-31848)
690490e