ntdll: Adds support for custom serial port baudrates on Mac

[Nathan Fearnley]

Mac OS X supports a special function call for custom baud rates. I have
implemented this feature to allow non-standard baud rates. Unfortunately,
setting any other parameters using tcsetattr will fail, because it does not
support the higher baud rates. In order to work around this, when setting
other parameters, the baud rate is temporarily set to 9600, then reset back
to custom rate after the changes are complete.
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