bdist_wininst doesn't execute postinstall script

[mhammond]

BPO	41771
Nosy	@mhammond, @vstinner
PRs	bpo-41771: Update how bdist_wininst loads Python so postinstall scripts again work. #22210

^{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/mhammond'
closed_at = <Date 2021-01-11.12:50:19.975>
created_at = <Date 2020-09-12.04:16:45.268>
labels = ['type-bug', '3.8', '3.9', '3.10']
title = "bdist_wininst doesn't execute postinstall script"
updated_at = <Date 2021-01-11.12:50:19.973>
user = 'https://github.com/mhammond'

bugs.python.org fields:

activity = <Date 2021-01-11.12:50:19.973>
actor = 'vstinner'
assignee = 'mhammond'
closed = True
closed_date = <Date 2021-01-11.12:50:19.975>
closer = 'vstinner'
components = []
creation = <Date 2020-09-12.04:16:45.268>
creator = 'mhammond'
dependencies = []
files = []
hgrepos = []
issue_num = 41771
keywords = ['patch']
message_count = 2.0
messages = ['376771', '384813']
nosy_count = 2.0
nosy_names = ['mhammond', 'vstinner']
pr_nums = ['22210']
priority = 'normal'
resolution = 'wont fix'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue41771'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

[mhammond]

install.c tries to dynamically load PyCFunction_New at

cpython/PC/bdist_wininst/install.c

Line 686 in fb27187

DECLPROC(hPython, PyObject *, PyCFunction_New, (PyMethodDef *, PyObject *));

- however, since 3.8 this no longer exists - PyCFunction_New is a #define which calls PyCFunction_NewEx

[vstinner]

The distutils bdist_wininst command has been removed in Python 3.10: see bpo-42802.