test_venv fails with --without-threads

[tiran]

BPO	19924
Nosy	@vsajip, @ncoghlan, @tiran, @dstufft
Superseder	bpo-19766: test_venv: test_with_pip() failed on "AMD64 Fedora without threads 3.x" buildbot: urllib3 dependency requires the threading module

^{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 2013-12-08.02:23:47.294>
created_at = <Date 2013-12-08.00:24:58.117>
labels = ['type-crash']
title = 'test_venv fails with --without-threads'
updated_at = <Date 2013-12-08.02:23:47.293>
user = 'https://github.com/tiran'

bugs.python.org fields:

activity = <Date 2013-12-08.02:23:47.293>
actor = 'ncoghlan'
assignee = 'none'
closed = True
closed_date = <Date 2013-12-08.02:23:47.294>
closer = 'ncoghlan'
components = []
creation = <Date 2013-12-08.00:24:58.117>
creator = 'christian.heimes'
dependencies = []
files = []
hgrepos = []
issue_num = 19924
keywords = []
message_count = 1.0
messages = ['205503']
nosy_count = 4.0
nosy_names = ['vinay.sajip', 'ncoghlan', 'christian.heimes', 'dstufft']
pr_nums = []
priority = 'high'
resolution = 'duplicate'
stage = 'needs patch'
status = 'closed'
superseder = '19766'
type = 'crash'
url = 'https://bugs.python.org/issue19924'
versions = ['Python 3.4']

[tiran]

The test fails when Python is compiled --without-threads. Two 3rd party modules import threading unconditionally:

pip/_vendor/distlib/util.py
import threading

pip/_vendor/requests/packages/urllib3/_collections.py
from threading import RLock