[issue20517] Support errors with two filenames for errno exceptions

[Larry Hastings]

Larry Hastings added the comment:

New patch incorporating Serhiy's suggestions.  Thanks, Serhiy!

Did more testing with the buildbots.  Windows Server 2008 32-bit and 64-bit were both fine.  So were ARMv7, OpenIndiana 64-bit, Gentoo 32-bit, FreeBSD 10 64-bit, and PowerLinux PPC 64-bit.  (This was all run using diff #3, but diff #4 doesn't change any C code.  It just changes the test and some docs.)

Can I get a LGTM?

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Added file: http://bugs.python.org/file34012/larry.oserror.add.filename2.4.diff

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