Remove platform.popen(), deprecated since Python 3.3

[vstinner]

BPO	35345
Nosy	@vstinner
PRs	bpo-35345: Remove platform.popen() #10781

^{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 2018-11-29.08:59:20.991>
created_at = <Date 2018-11-28.23:54:11.383>
labels = ['3.8', 'library']
title = 'Remove platform.popen(), deprecated since Python 3.3'
updated_at = <Date 2018-11-29.08:59:20.990>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2018-11-29.08:59:20.990>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2018-11-29.08:59:20.991>
closer = 'vstinner'
components = ['Library (Lib)']
creation = <Date 2018-11-28.23:54:11.383>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 35345
keywords = ['patch']
message_count = 2.0
messages = ['330639', '330669']
nosy_count = 1.0
nosy_names = ['vstinner']
pr_nums = ['10781']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue35345'
versions = ['Python 3.8']

[vstinner]

platform.popen() is deprecated since Python 3.3: bpo-11377. Calling the function emits a DeprecationWarning and the function is documented as being deprecated.

The function is documented in the "Win95/98 specific":
https://docs.python.org/dev/library/platform.html#win95-98-specific

Python 3.5 dropped Windows XP support. I don't think that Python 2.7 still support Windows 98. So it's time to remove support for this old OS.

Python 3 now has a os.popen() function:
https://docs.python.org/dev/library/os.html#os.popen

[vstinner]

New changeset 73104fa by Victor Stinner in branch 'master':
bpo-35345: Remove platform.popen() (GH-10781)
73104fa