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MRI compatibility with IO::sysopen for serial ports on windows #5809
These changes make JRuby be compatible with MRI's API's and behaviors on Windows serial ports.
Fileno is now real in most cases, but lazily generated in most cases to avoid sucking up 2x the number of file resources.
I put the WinC interface in FilenoUtils arbitrarily, I wasn't sure the best place to put it