If I built with an unfinished puzzle enabled, then it will end up in
the 'unfinished' subdir of the main build directory, so desktop.pl
will need to write out a reference to it there.
immediate intention is to run this locally so that my XFCE main menu
acquires shortcuts for my locally compiled puzzle binaries, but I
expect the script could probably be adapted for systemwide
distribution use if any distribution hasn't already done this job in
their own way by now.
[originally from svn r9859]
