Remove MacOS 9-specific codes from exit() and quit()

[yan12125]

BPO	28323
Nosy	@gvanrossum, @ronaldoussoren, @ned-deily, @yan12125
Files	quit-macos9.patch

^{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 2016-10-02.01:35:13.368>
created_at = <Date 2016-10-01.09:47:07.098>
labels = ['OS-mac', '3.7', 'library']
title = 'Remove MacOS 9-specific codes from exit() and quit()'
updated_at = <Date 2016-10-02.01:35:13.363>
user = 'https://github.com/yan12125'

bugs.python.org fields:

activity = <Date 2016-10-02.01:35:13.363>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2016-10-02.01:35:13.368>
closer = 'ned.deily'
components = ['Library (Lib)', 'macOS']
creation = <Date 2016-10-01.09:47:07.098>
creator = 'yan12125'
dependencies = []
files = ['44903']
hgrepos = []
issue_num = 28323
keywords = ['patch']
message_count = 3.0
messages = ['277802', '277838', '277840']
nosy_count = 5.0
nosy_names = ['gvanrossum', 'ronaldoussoren', 'ned.deily', 'python-dev', 'yan12125']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue28323'
versions = ['Python 3.6', 'Python 3.7']

[yan12125]

As per PEP-11, MacOS 9 support is removed in Python 2.4. There are some leftovers in CPython code base, among which site.setquit is an example. I propose to remove it for cleaner codes.

Added Mac experts as well as Guido, the author of this code in the 18-years-ago changeset 813f527f3bec

[python-dev]

New changeset 2d8d9abb3bf8 by Ned Deily in branch '3.6':
Issue bpo-28323: Remove vestigal MacOS 9 checks from exit() and quit().
https://hg.python.org/cpython/rev/2d8d9abb3bf8

New changeset 2c7034d59c7b by Ned Deily in branch 'default':
Issue bpo-28323: Merge from 3.6
https://hg.python.org/cpython/rev/2c7034d59c7b

[ned-deily]

Thanks for the patch!