Raw mode for current-input-port.

[Rob Browning]

I'd like to have (read-char) return immediately when a key is pressed,
rather than waiting for a carriage return.  At first I thought setvbuf
would do it, but then I recalled that that was probably designed for
output ports.  So do we already have anything suitable?  I'm guessing
cfmakeraw might work, but I'd need to wrap that.

Thanks

-- 
Rob Browning
rlb @defaultvalue.org, @linuxdevel.com, and @debian.org
Previously @cs.utexas.edu
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