Added inclusion of itcl.h if HAVE_ITCL is set, to get prototypes.
Added inclusion of itcl.h if HAVE_ITCL is set, to get prototypes.

svn path=/trunk/; revision=2859

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