Create cygwin32 and cygwin64 .good files for ioerror test.

Previously, there was only a .cygwin.good file, which no longer matches any of
the platform values.
Merge pull request #984 from thomasvandoren/fix-cygwin-good

Create cygwin32 and cygwin64 .good files for ioerror test.

Previously, there was only a .cygwin.good file, which no longer matches any of
the platform values.