ensure that the 'safe' objects remain safe

ensure that the 'safe' objects remain safe

since Elbereth doesn't work if you're not on the square anymore, we need
to make sure that critters are discouraged from grabbing the sokoban
prize or the castle wand.

also, fix up the level compiler makefiles so that uncommenting the
YACC/LEX definitions (presuming you have the right tools installed)
works properly.