Fix Calc graph output on MS-Windows
The previous code relied on "pgnuplot" executable, which is no longer provided with Gnuplot 5.x. * lisp/calc/calc.el (calc-gnuplot-name): Set to "pgnuplot" on MS-Windows only if such an executable exists. * lisp/calc/calc-graph.el (calc-graph-w32-p): New defsubst. (calc-graph-plot, calc-graph-command, calc-gnuplot-command) (calc-graph-init): Call calc-graph-w32-p wherever we need to do something special for invoking gnuplot on MS-Windows, instead of comparing against calc-gnuplot-name. (calc-graph-plot): Set the terminal to "qt" on MS-Windows when pgnuplot.exe is not available. (calc-graph-kill): Delete the temporary files only after killing the gnuplot process, otherwise the deletion might fail on MS-Windows because the files are still in use.
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