virtual conf file encoding error on windows

[tanbro]

BPO	25540
Nosy	@serhiy-storchaka
Superseder	bpo-25185: Inconsistency between venv and site

^{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 2015-11-03.09:09:21.034>
created_at = <Date 2015-11-03.06:58:31.587>
labels = ['type-crash']
title = 'virtual conf file encoding error on windows'
updated_at = <Date 2015-11-03.09:09:21.027>
user = 'https://bugs.python.org/tanbro'

bugs.python.org fields:

activity = <Date 2015-11-03.09:09:21.027>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2015-11-03.09:09:21.034>
closer = 'serhiy.storchaka'
components = []
creation = <Date 2015-11-03.06:58:31.587>
creator = 'tanbro'
dependencies = []
files = []
hgrepos = []
issue_num = 25540
keywords = []
message_count = 2.0
messages = ['253968', '253974']
nosy_count = 2.0
nosy_names = ['serhiy.storchaka', 'tanbro']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = '25185'
type = 'crash'
url = 'https://bugs.python.org/issue25540'
versions = ['Python 3.5']

[tanbro]

When create a new venv on windows, sometimes an UnicodeDecodeError occurred.

It seems that, it is caused by the system module site.

In [Lib/site.py](https://github.com/python/cpython/blob/main/Lib/site.py), line 468::

        with open(virtual_conf) as f:
            for line in f:
                line = line.strip()

The file virtual_conf was open with encoding gbk which is my windows default encoding, but in fact, the file is an utf-8 one, so i think it should be::

        with open(virtual_conf, encoding='utf-8') as f:
            for line in f:
                line = line.strip()

[serhiy-storchaka]

Already fixed in bpo-25185.