allow path-like objects in program arguments in Windows

[guoci]

BPO	34699
Nosy	@serhiy-storchaka, @guoci
PRs	bpo-34699: allow path-like objects in program arguments in Windows #9336
Superseder	bpo-31961: subprocess._execute_child doesn't accept a single PathLike argument for args

^{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 2018-11-09.08:07:29.337>
created_at = <Date 2018-09-15.19:20:16.524>
labels = ['3.8', '3.7', 'library']
title = 'allow path-like objects in program arguments in Windows'
updated_at = <Date 2018-11-09.08:07:29.337>
user = 'https://github.com/guoci'

bugs.python.org fields:

activity = <Date 2018-11-09.08:07:29.337>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2018-11-09.08:07:29.337>
closer = 'serhiy.storchaka'
components = ['Library (Lib)']
creation = <Date 2018-09-15.19:20:16.524>
creator = 'guoci'
dependencies = []
files = []
hgrepos = []
issue_num = 34699
keywords = ['patch']
message_count = 2.0
messages = ['325454', '325458']
nosy_count = 2.0
nosy_names = ['serhiy.storchaka', 'guoci']
pr_nums = ['9336']
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '31961'
type = None
url = 'https://bugs.python.org/issue34699'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']

[guoci]

Currently, the subprocess.Popen function allows for path-like objects in the argument list for POSIX but not in Windows.
This PR makes Windows' subprocess.Popen accept path-like objects in the argument list.

[serhiy-storchaka]

This looks like a duplicate of bpo-31961.