Created originally on Bitbucket by msabramo (Marc Abramowitz)
Changesets for this Pull Request have not been imported, because it had been already declined on Bitbucket. Marked as closed by the import user.
This adds function
PyErr_SetFromErrnoWithFilenameObject (which exists in the CPython C API) to cpyext.
This fixes the following bug: https://bugs.pypy.org/issue991