[issue32316] [3.6] make regen-all fails on Travis CI on "python3.6" command

[STINNER Victor]

New submission from STINNER Victor <victor.stinner at gmail.com>:

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

----------
components: Build
messages: 308262
nosy: brett.cannon, vstinner, zach.ware
priority: normal
severity: normal
status: open
title: [3.6] make regen-all fails on Travis CI on "python3.6" command
versions: Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32316>
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