[issue28410] Add convenient C API for "raise ... from ..."

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


Added file: http://bugs.python.org/file45128/_PyErr_FormatFromCause-3.5.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28410>
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