Arrange that we really _can_ compile all the puzzles into a single

binary if we choose: fix bugs in cube.c and sixteen.c that manifest
when compiled that way, and introduce list.c which provides a global
list of all the available puzzles.

[originally from svn r5169]

list.c

@@ -0,0 +1,38 @@
+/*
+ * list.c: List of puzzles.
+ */
+
+#include "puzzles.h"
+
+/*
+ * The available games can be most easily enumerated by searching
+ * for the line in each game source file saying "#define thegame
+ * <gamename>". Hence, the following piece of shell/Perl should
+ * regenerate this list automatically:
+
+perl -ne '/^#define thegame (\S+)/ and $1 ne "nullgame" and print "extern const game $1;\n"' *.c
+echo -e '\nconst game *gamelist[] = {'
+perl -ne '/^#define thegame (\S+)/ and $1 ne "nullgame" and print "    &$1,\n"' *.c
+echo -e '};\n\nconst int gamecount = lenof(gamelist);'
+
+ */
+
+extern const game cube;
+extern const game fifteen;
+extern const game net;
+extern const game netslide;
+extern const game pattern;
+extern const game rect;
+extern const game sixteen;
+
+const game *gamelist[] = {
+    &cube,
+    &fifteen,
+    &net,
+    &netslide,
+    &pattern,
+    &rect,
+    &sixteen,
+};
+
+const int gamecount = lenof(gamelist);