Delete undefined function declarations.
extern void determine_today_mon(bool conv_old);
extern void play_game(bool new_game);
extern bool psychometry(void);
extern void determine_today_mon(bool conv_old);
extern void play_game(bool new_game);
extern bool psychometry(void);
-extern void leave_level(int level);
-extern void enter_level(int level);
extern s32b turn_real(s32b hoge);
extern void prevent_turn_overflow(void);
extern s32b turn_real(s32b hoge);
extern void prevent_turn_overflow(void);