Drop support of FreeBSD 9 and older in Python 3.7

[vstinner]

BPO	32593
Nosy	@vstinner, @koobs
PRs	bpo-32593: Drop FreeBSD 9 and older support #5232 bpo-32593: distutils UnixCCompiler: remove FreeBSD special case #5233 bpo-32593: Run autoconf #5282

^{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 2018-01-22.17:33:53.569>
created_at = <Date 2018-01-18.10:08:47.269>
labels = ['build', '3.7']
title = 'Drop support of FreeBSD 9 and older in Python 3.7'
updated_at = <Date 2018-01-23.12:14:10.520>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2018-01-23.12:14:10.520>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2018-01-22.17:33:53.569>
closer = 'vstinner'
components = ['Build']
creation = <Date 2018-01-18.10:08:47.269>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 32593
keywords = ['patch']
message_count = 4.0
messages = ['310229', '310436', '310438', '310499']
nosy_count = 2.0
nosy_names = ['vstinner', 'koobs']
pr_nums = ['5232', '5233', '5282']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue32593'
versions = ['Python 3.7']

[vstinner]

FreeBSD 9.3 support ended at December 31, 2016. It's time to drop code for compatibility with FreeBSD 9 and older.
https://www.freebsd.org/security/unsupported.html

Attached PR removes this code.

[vstinner]

New changeset 13ff245 by Victor Stinner in branch 'master':
bpo-32593: Drop FreeBSD 9 and older support (bpo-5232)
13ff245

[vstinner]

For the PR 5233 : I suggest to continue the discussion on bpo-20767. This PR is unrelated to this issue (drop support for old FreeBSDs).

[vstinner]

New changeset 872f841 by Victor Stinner in branch 'master':
bpo-32593: Run autoconf (bpo-5282)
872f841