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.

[originally from svn r7206]

netslide.R

@@ -15,3 +15,7 @@ GAMES += netslide
 !begin >list.c
     A(netslide) \
 !end
+
+!begin >wingames.lst
+netslide.exe
+!end