WIP: Always pass errno argument for OSError subclasses #109720
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It solves #109601, but covers not only TimeoutError, but other OSError subclasses.
With #109714 these changes will be unneeded (except that some calls may be improved to set filename), because errno and strerror will be set automatically. This PR is a demonstration of changes when do it explicitly. #109714 be accepted and we decide to apply these changes to older versions, this PR will be converted in a backport PR.