[issue22117] Rewrite pytime.h to work on nanoseconds

[Roundup Robot]

Roundup Robot added the comment:

New changeset f841d3bc30ee by Victor Stinner in branch 'default':
Issue #23618, #22117: refactor socketmodule.c
https://hg.python.org/cpython/rev/f841d3bc30ee

New changeset ae551abe398d by Victor Stinner in branch 'default':
Issue #22117: Write unit tests for _PyTime_AsTimeval()
https://hg.python.org/cpython/rev/ae551abe398d

New changeset c0c7d258c1ed by Victor Stinner in branch 'default':
Issue #22117: The socket module uses _PyTime_t timestamp for timeouts
https://hg.python.org/cpython/rev/c0c7d258c1ed

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