Set PROPERTIES GENERATED ON for the f77 examples files that are generated by a custom command.  This allows some simplification of dependency tracking.
Set PROPERTIES GENERATED ON for the f77 examples files that are generated
by a custom command.  This allows some simplification of dependency tracking.

Do not set PROPERTIES GENERATED ON for plf77demos.inc since that is a file
that is configured at cmake time and not generated at build time.

svn path=/trunk/; revision=10402

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