Use NEW CMP0007 policy (empty elements are not ignored in lists) for cmake 2.6.0 and above.
Use NEW CMP0007 policy (empty elements are not ignored in lists) for cmake
2.6.0 and above.

svn path=/trunk/; revision=8404

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