gnuplot: Updated (4.2.3 -> 4.2.4)

scientific/gnuplot/gnuplot.desc

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 [L] OpenSource
 [S] Stable
-[V] 4.2.3
+[V] 4.2.4
 [P] X -----5-7-9 133.700
 
-[D] 1941494485 gnuplot-4.2.3.tar.gz http://dl.sourceforge.net/sourceforge/gnuplot/
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+[D] 2699436309 gnuplot-4.2.4.tar.gz http://dl.sourceforge.net/sourceforge/gnuplot/