Fix warning in _PyPathConfig

Fix warning in _PyPathConfig_ComputeArgv0

BPO	36308
Nosy	@vstinner, @serhiy-storchaka, @matrixise, @pablogsal
PRs	bpo-36308: Fix _PyPathConfig_ComputeArgv0 warning #12357

^{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 2019-03-19.15:56:32.049>
created_at = <Date 2019-03-15.20:25:34.559>
labels = ['3.8']
title = 'Fix warning in _PyPathConfig_ComputeArgv0'
updated_at = <Date 2019-03-19.16:10:41.011>
user = 'https://github.com/matrixise'

bugs.python.org fields:

activity = <Date 2019-03-19.16:10:41.011>
actor = 'matrixise'
assignee = 'none'
closed = True
closed_date = <Date 2019-03-19.15:56:32.049>
closer = 'matrixise'
components = []
creation = <Date 2019-03-15.20:25:34.559>
creator = 'matrixise'
dependencies = []
files = []
hgrepos = []
issue_num = 36308
keywords = ['patch']
message_count = 6.0
messages = ['338027', '338029', '338369', '338370', '338373', '338374']
nosy_count = 4.0
nosy_names = ['vstinner', 'serhiy.storchaka', 'matrixise', 'pablogsal']
pr_nums = ['12357']
priority = 'normal'
resolution = None
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue36308'
versions = ['Python 3.8']