Make sure MSYS_PLATFORM is off for Cygwin in all cases.
Make sure MSYS_PLATFORM is off for Cygwin in all cases.

svn path=/trunk/; revision=12829

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