Clear up LCD-related compile issues

Marlin/src/lcd/ultralcd.cpp

@@ -24,6 +24,8 @@
 
 #if ENABLED(ULTRA_LCD)
 
+#include <stdarg.h>
+
 #include "ultralcd.h"
 
 #include "../sd/cardreader.h"
@@ -4867,7 +4869,7 @@ void lcd_quick_feedback(const bool clear_buttons) {
       callbackFunc = callback; \
       liveEdit = live; \
     } \
-    typedef void _name
+    typedef void _name##_void
 
   DEFINE_MENU_EDIT_TYPE(int16_t, int3, itostr3, 1);
   DEFINE_MENU_EDIT_TYPE(uint8_t, int8, i8tostr3, 1);