Add some ancient AVR compat _P function definitions

Author: earlephilhower

api/deprecated-avr-comp/avr/pgmspace.h

@@ -98,6 +98,8 @@ typedef const void* uint_farptr_t;
 
 #define sprintf_P(s, f, ...) sprintf((s), (f), __VA_ARGS__)
 #define snprintf_P(s, f, ...) snprintf((s), (f), __VA_ARGS__)
+#define vsprintf_P(s, f, ...) vsprintf((s), (f), __VA_ARGS__)
+#define vsnprintf_P(s, f, ...) vsnprintf((s), (f), __VA_ARGS__)
 
 #if 0
 // Requires natural aligned addresses