Added a cast from (void *) to (PLDispatchInit) to satisfy the picky IRIX C compiler.
Added a cast from (void *) to (PLDispatchInit) to satisfy the picky IRIX
C compiler.

svn path=/trunk/; revision=4217

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