Use an explicit cast to solve the const-ness mismatch in the call to Tcl_SetResult.
Use an explicit cast to solve the const-ness mismatch in the call to Tcl_SetResult.

svn path=/trunk/; revision=12308

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