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Computation hSetBuffering hdl mode sets the mode of buffering for handle hdl on subsequent reads and writes.
* If mode is LineBuffering, line-buffering is enabled if possible.
* If mode is BlockBuffering size, then block-buffering is enabled if possible. The size of the buffer is n items if size is Just n and is otherwise implementation-dependent.
* If mode is NoBuffering, then buffering is disabled if possible.
If the buffer mode is changed from BlockBuffering or LineBuffering to NoBuffering, then
* if hdl is writable, the buffer is flushed as for hFlush;
* if hdl is not writable, the contents of the buffer is discarded.
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