Update for latest mintlib, and remove duplicated defines

src/video/ataricommon/SDL_gemdosevents.c

@@ -45,13 +45,6 @@ static unsigned char gemdos_currentkeyboard[ATARIBIOS_MAXKEYS];
 static unsigned char gemdos_previouskeyboard[ATARIBIOS_MAXKEYS];
 static SDL_bool use_dev_mouse = SDL_FALSE;
 
-#ifndef DEV_BUSY
-enum {
-	DEV_BUSY=0,
-	DEV_READY
-};
-#endif
-
 static void UpdateSpecialKeys(int special_keys_state);
 
 void AtariGemdos_InitOSKeymap(_THIS)