Fixed up a couple of logic errors in the dependencies in the gd driver (ie png is dependent on libz and libpng but not libjpeg etc...) ----------------------------------------------------------------------
Fixed up a couple of logic errors in the dependencies in the gd
driver (ie png is dependent on libz and libpng but not libjpeg
etc...)
----------------------------------------------------------------------

svn path=/trunk/; revision=5800

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