[C API] Upgrade the C API in extension modules

[vstinner]

BPO	42519
Nosy	@vstinner, @shihai1991
PRs	bpo-42519: Replace PyMem_MALLOC() with PyMem_Malloc() #23586 bpo-42519: Replace PyObject_MALLOC() with PyObject_Malloc() #23587

^{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 2020-12-16.08:16:58.601>
created_at = <Date 2020-12-01.08:55:35.598>
labels = ['expert-C-API', '3.10']
title = '[C API] Upgrade the C API in extension modules'
updated_at = <Date 2020-12-16.08:16:58.600>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2020-12-16.08:16:58.600>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2020-12-16.08:16:58.601>
closer = 'vstinner'
components = ['C API']
creation = <Date 2020-12-01.08:55:35.598>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 42519
keywords = ['patch']
message_count = 3.0
messages = ['382220', '382221', '382224']
nosy_count = 2.0
nosy_names = ['vstinner', 'shihai1991']
pr_nums = ['23586', '23587']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue42519'
versions = ['Python 3.10']

[vstinner]

Python has around 118 extension modules. Most of them are quite old and still use the old way to write C extensions. I created this issue as a placeholder to modernize the code using my new tool:
https://github.com/pythoncapi/upgrade_pythoncapi

For example, replace PyMem_MALLOC() with PyMem_Malloc(), since PyMem_MALLOC() is a deprecated alias.

[vstinner]

New changeset 00d7abd by Victor Stinner in branch 'master':
bpo-42519: Replace PyMem_MALLOC() with PyMem_Malloc() (GH-23586)
00d7abd

[vstinner]

New changeset 32bd68c by Victor Stinner in branch 'master':
bpo-42519: Replace PyObject_MALLOC() with PyObject_Malloc() (GH-23587)
32bd68c