Convert posixmodule.c to multiphase initialization (PEP 489)

[vstinner]

BPO	40549
Nosy	@vstinner, @shihai1991
PRs	bpo-40549: Convert posixmodule.c to multiphase init #19982 bpo-40549: posixmodule.c uses defining_class #20075

^{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 2020-05-10.09:56:10.313>
created_at = <Date 2020-05-07.18:05:48.192>
labels = ['interpreter-core', '3.9']
title = 'Convert posixmodule.c to multiphase initialization (PEP 489)'
updated_at = <Date 2020-05-14.16:06:05.869>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2020-05-14.16:06:05.869>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2020-05-10.09:56:10.313>
closer = 'vstinner'
components = ['Interpreter Core']
creation = <Date 2020-05-07.18:05:48.192>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 40549
keywords = ['patch']
message_count = 3.0
messages = ['368362', '368572', '368845']
nosy_count = 2.0
nosy_names = ['vstinner', 'shihai1991']
pr_nums = ['19982', '20075']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue40549'
versions = ['Python 3.9']

[vstinner]

Attached PR converts posixmodule.c to multiphase initialization (PEP-489).

It uses the new shiny PyType_FromModuleAndSpec() and PyType_GetModule() of the PEP-573 added by bpo-38787.

The PR removes the following macro :-)

#define _posixstate_global ((_posixstate *)PyModule_GetState(PyState_FindModule(&posixmodule)))

[vstinner]

New changeset 1c2fa78 by Victor Stinner in branch 'master':
bpo-40549: Convert posixmodule.c to multiphase init (GH-19982)
1c2fa78

[vstinner]

New changeset 97f33c3 by Victor Stinner in branch 'master':
bpo-40549: posixmodule.c uses defining_class (GH-20075)
97f33c3