Added substitution of HAVE_ITCL if enable_itcl == yes.
Added substitution of HAVE_ITCL if enable_itcl == yes.

svn path=/trunk/; revision=1666

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