Make check_plplot_h.inc target to check consistency of plplot_h.inc.
Make check_plplot_h.inc target to check consistency of plplot_h.inc.

svn path=/trunk/; revision=12539

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot