bpo-37705: Improve the implementation of winerror_to_errno() (GH-15623)


winerror_to_errno() is no longer automatically generated.
Do not rely on the old _dosmapperr() function.
Add ERROR_NO_UNICODE_TRANSLATION (1113) -> EILSEQ.
(cherry picked from commit 19052a11314e7be7ba003fd6cdbb5400a5d77d96)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>
3 files changed