asyncio: replace _compute_returncode() with os.waitstatus_to

asyncio: replace _compute_returncode() with os.waitstatus_to_exitcode()

BPO	40364
Nosy	@vstinner, @asvetlov, @1st1, @corona10, @aeros
PRs	bpo-40364: asyncio uses os.waitstatus_to_exitcode() #23798

^{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/aeros'
closed_at = <Date 2020-12-16.11:11:45.472>
created_at = <Date 2020-04-22.16:51:11.732>
labels = ['library', '3.10', 'expert-asyncio']
title = 'asyncio: replace _compute_returncode() with os.waitstatus_to_exitcode()'
updated_at = <Date 2020-12-16.11:11:45.471>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2020-12-16.11:11:45.471>
actor = 'vstinner'
assignee = 'aeros'
closed = True
closed_date = <Date 2020-12-16.11:11:45.472>
closer = 'vstinner'
components = ['Library (Lib)', 'asyncio']
creation = <Date 2020-04-22.16:51:11.732>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 40364
keywords = ['patch']
message_count = 3.0
messages = ['367021', '367043', '383150']
nosy_count = 5.0
nosy_names = ['vstinner', 'asvetlov', 'yselivanov', 'corona10', 'aeros']
pr_nums = ['23798']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue40364'
versions = ['Python 3.10']