Made char array which holds the application icon information "const char*" to prevent warnings showing up with "-Wwrite-strings" g++ option.
Made char array which holds the application icon information "const char*" to prevent warnings showing up with "-Wwrite-strings" g++ option.

svn path=/trunk/; revision=8183

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