PDLPorters/PDL-Graphics-Gnuplot

Fix mismatch in how Gnuplot is found during configure and runtime

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zmughal commented
  • Currently Makefile.PL only uses the PATH during configure time while Gnuplot.pm uses Alien::Gnuplot.
  • Make both use Alien::Gnuplot (i.e., make the Alien a config dep). This will allow overriding via the GNUPLOT_BINARY env variable (e.g., for testing multiple versions of Gnuplot).