Remove deprecated functions marked for removal in 3.10

[remilapeyre]

BPO	40937
Nosy	@serhiy-storchaka, @remilapeyre
PRs	bpo-40937: Do not expose abstract collection classes in the collections module #20774 bpo-40937: Remove deprecated universal mode #20775

^{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 = None
created_at = <Date 2020-06-10.10:43:59.797>
labels = ['library', '3.10']
title = 'Remove deprecated functions marked for removal in 3.10'
updated_at = <Date 2020-06-11.06:47:06.341>
user = 'https://github.com/remilapeyre'

bugs.python.org fields:

activity = <Date 2020-06-11.06:47:06.341>
actor = 'remi.lapeyre'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-06-10.10:43:59.797>
creator = 'remi.lapeyre'
dependencies = []
files = []
hgrepos = []
issue_num = 40937
keywords = ['patch']
message_count = 1.0
messages = ['371178']
nosy_count = 2.0
nosy_names = ['serhiy.storchaka', 'remi.lapeyre']
pr_nums = ['20774', '20775']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue40937'
versions = ['Python 3.10']

[remilapeyre]

The following modules have functions marked for deprecation in Python 3.10:

• asyncio-queue
• asyncio-subprocess
• asyncio-sync
• asyncio-task
• collections
• builtins
• gettext
• the old parser

I already opened a PR to remove those in gettext and Pablo Galindo removed the old parser. I will open PRs to fix the remainding modules.

Instead of creating a new issue to track those separately, I thought it would be easier to list them all here and open multiple PRs.

[iritkatriel]

I believe this was all done in other issues.