`Guess', a Mastermind clone from James Harvey. This checkin also

introduces a few new utility functions in misc.c, one of which is
the bitmap obfuscator from Mines (which has therefore been moved out
of mines.c).

[originally from svn r5992]

list.c

@@ -20,6 +20,7 @@ echo -e '};\n\nconst int gamecount = lenof(gamelist);'
 extern const game cube;
 extern const game fifteen;
 extern const game flip;
+extern const game guess;
 extern const game mines;
 extern const game net;
 extern const game netslide;
@@ -34,6 +35,7 @@ const game *gamelist[] = {
     &cube,
     &fifteen,
     &flip,
+    &guess,
     &mines,
     &net,
     &netslide,