Use "z" for PY_FORMAT_SIZE_T

[methane]

BPO	37781
Nosy	@methane
PRs	bpo-37781: use "z" for PY_FORMAT_SIZE_T #15156

^{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 2019-08-30.23:58:56.778>
created_at = <Date 2019-08-07.02:07:14.868>
labels = ['3.9']
title = 'Use "z" for PY_FORMAT_SIZE_T'
updated_at = <Date 2019-08-30.23:58:56.777>
user = 'https://github.com/methane'

bugs.python.org fields:

activity = <Date 2019-08-30.23:58:56.777>
actor = 'methane'
assignee = 'none'
closed = True
closed_date = <Date 2019-08-30.23:58:56.778>
closer = 'methane'
components = []
creation = <Date 2019-08-07.02:07:14.868>
creator = 'methane'
dependencies = []
files = []
hgrepos = []
issue_num = 37781
keywords = ['patch']
message_count = 2.0
messages = ['349147', '350899']
nosy_count = 1.0
nosy_names = ['methane']
pr_nums = ['15156']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue37781'
versions = ['Python 3.9']

[methane]

MSVC 2015 supports "z" for size_t format.
I'm not sure about 2013.

AIX support it too. Now "z" is portable enough.
https://mail.python.org/archives/list/python-dev@python.org/thread/CAXKWESUIWJNJFLLXXWTQDUWTN3F7KOU/#QVSBYYICHYC3IFITF4QNMGIOLOGAQS6I

[methane]

New changeset d765d81 by Inada Naoki in branch 'master':
bpo-37781: use "z" for PY_FORMAT_SIZE_T (GH-15156)
d765d81