Correct type declarations to once again allow building Ada with an Ada 95 compiler.
Correct type declarations to once again allow building Ada with an Ada 95 compiler.

svn path=/trunk/; revision=12890

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