[issue38113] Remove statics from ast.c

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> New changeset ac46eb4ad6662cf6d771b20d8963658b2186c48c by Eric Snow (Dino Viehland) in branch 'master':
> bpo-38113: Update the Python-ast.c generator to PEP384 (gh-15957)

This change introduced a subtle regression: bpo-41194. I modified the _ast module to use again a global state:

New changeset 91e1bc18bd467a13bceb62e16fbc435b33381c82 by Victor Stinner in branch 'master':
bpo-41194: The _ast module cannot be loaded more than once (GH-21290)
https://github.com/python/cpython/commit/91e1bc18bd467a13bceb62e16fbc435b33381c82


I also proposed PR 21293 to use again a module state, even if the implementation has some drawbacks (see the PR comments).

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