gnuplot patch to speed up cygwin implementation by 2x

[Jim Kleckner]

The attached patch for gnuplot speeds it up on Cygwin
by around 2.5x due to unbuffered reads for all file types.

I will submit it upstream as well.

See this link for the original discussion:
  http://tinyurl.com/6c4sse
  http://thread.gmane.org/gmane.comp.graphics.gnuplot.devel/2189/focus=2207


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