plInBuildTree() is always needed, move out of conditional ENABLE_DYNDRIVERS
plInBuildTree() is always needed, move out of conditional ENABLE_DYNDRIVERS

svn path=/trunk/; revision=4958

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