[issue27903] Avoid ResourceWarnings from platform._dist_try_harder

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

Python 3.6 and 3.7 are still supported. The patch LGTM, I converted it to a PR.

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resolution: out of date -> 
status: closed -> open
versions: +Python 3.6, Python 3.7

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<https://bugs.python.org/issue27903>
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