Propagate HAVE_SHAPELIB CMake variable to a C macro with the same name.
Propagate HAVE_SHAPELIB CMake variable to a C macro with the same name.

svn path=/trunk/; revision=12241

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