[3.6] make regen-all fails on Travis CI on "python3.6" command

[vstinner]

BPO	32316
Nosy	@brettcannon, @vstinner, @zware
PRs	[3.6] bpo-32316: All Travis CI jobs uses Python 3.6 #4853

^{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 2017-12-13.23:52:31.964>
created_at = <Date 2017-12-13.22:32:34.304>
labels = ['build']
title = '[3.6] make regen-all fails on Travis CI on "python3.6" command'
updated_at = <Date 2017-12-13.23:52:31.963>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2017-12-13.23:52:31.963>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2017-12-13.23:52:31.964>
closer = 'vstinner'
components = ['Build']
creation = <Date 2017-12-13.22:32:34.304>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 32316
keywords = ['patch']
message_count = 2.0
messages = ['308262', '308268']
nosy_count = 3.0
nosy_names = ['brett.cannon', 'vstinner', 'zach.ware']
pr_nums = ['4853']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue32316'
versions = ['Python 3.6']

[vstinner]

The cpython job of Travis CI compiles Python with clang and then run "make regen-all" which fails.

"make regen-all" fails for example on regen-typeslots which runs "$(PYTHON_FOR_REGEN) ...". On Travis CI, $(PYTHON_FOR_REGEN) is "python3.6", but running python3.6 fails with:

"""
The `python3.6' command exists in these Python versions:
3.6
3.6.3
"""

Example of failed build:
https://travis-ci.org/python/cpython/jobs/315978517

[vstinner]

New changeset 1d2a387 by Victor Stinner in branch '3.6':
bpo-32316: Travis CI: use PYTHON_FOR_REGEN=python3 (bpo-4853)
1d2a387