Changed config.log to plconfig.log so as not to conflict with the usage from AutoConf 2.x.
Changed config.log to plconfig.log so as not to conflict with the usage from
AutoConf 2.x.

svn path=/trunk/; revision=1561

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