unix: Improve baud rate handling. #135

[Travis Whitaker]

Greetings Haskellers,

I am writing to draw your attention to
https://github.com/haskell/unix/pull/135.

The unix library conditionally supports the common baud rate extensions
57600 and 115200. Modern POSIX systems support a much wider set of
extensions, and this PR adds additional extended baud rates that have been
available on MacOS and Linux for several years. The same CPP mechanism for
conditionally enabling these extensions is used.

The PR has been open for a few months and I am interested in moving it
forward.

Thanks for your time,

Travis Whitaker
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