Defines starting with `g' in windoom

• GAME_EXIT src/windoom.c:196
• GAME_LIMBO src/windoom.c:198
• GAME_MENU src/windoom.c:194
• GAME_PAUSE src/windoom.c:199
• GAME_PLAY src/windoom.c:195
• GAME_QUIT src/i_system.c:129
• GAME_SPLASH src/windoom.c:193
• GAME_START src/windoom.c:192
• GLOWSPEED src/p_spec.h:176