[issue36818] Add PyInterpreterState.runtime.

[STINNER Victor]

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

This change introduced a regression:
https://bugs.python.org/issue37135#msg344511

I had to revert the change to fix Python for 3.8 beta1 release.

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resolution: fixed -> 
status: closed -> open

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