Build script for Puzzles using bob. I've also added a piece of extra

Build script for Puzzles using bob. I've also added a piece of extra
infrastructure to the mkfiles.pl framework for the convenience of
the build script: it generates `wingames.lst', a list of the Windows
binaries which are ship-worthy games as opposed to nullgame or
command-line auxiliary programs.

git-svn-id: svn://svn.tartarus.org/sgt/puzzles@7206 cda61777-01e9-0310-a592-d414129be87e