Fix PYTHON_DEVEL macro problems when more than one file is found by find commands.
Fix PYTHON_DEVEL macro problems when more than one file is found by find
commands.

svn path=/trunk/; revision=5399

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