[issue22117] Rewrite pytime.h to work on nanoseconds

[Roundup Robot]

Roundup Robot added the comment:

New changeset adbc9e6162fe by Victor Stinner in branch 'default':
Issue #22117: The thread module uses the new _PyTime_t timestamp API
https://hg.python.org/cpython/rev/adbc9e6162fe

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<http://bugs.python.org/issue22117>
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