Replace IOError and WindowsError aliases with OSError #4536
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Fixes #4535.
Changes proposed in this pull request:
Two questions:
In
src/PIL/ImageFile.py
, this PR renames theraise_ioerror
helper function toraise_oserror
. Technically this could be considered a breaking change.raise_ioerror
with a deprecation warning?_raise_oserror
to indicate it is internal?