Improve printf_P() compatibility on Teensy 3.x

teensy3/avr/pgmspace.h

 #define strstr_P(a, b) strstr((a), (b))
 #define sprintf_P(s, ...) sprintf((s), __VA_ARGS__)
 #define vfprintf_P(fp, s, ...) vfprintf((fp), (s), __VA_ARGS__)
-#define printf_P(f, ...) printf((f), __VA_ARGS__)
-#define snprintf_P(s, n, f, ...) snprintf((s), (n), (f), __VA_ARGS__)
-#define vsprintf_P(s, f, ...) vsprintf((s), (f), __VA_ARGS__)
-#define vsnprintf_P(s, n, f, ...) vsnprintf((s), (n), (f), __VA_ARGS__)
-#define fprintf_P(fp, f, ...) fprintf((fp), (f), __VA_ARGS__)
+#define printf_P(...) printf(__VA_ARGS__)
+#define snprintf_P(s, n, ...) snprintf((s), (n), __VA_ARGS__)
+#define vsprintf_P(s, ...) vsprintf((s), __VA_ARGS__)
+#define vsnprintf_P(s, n, ...) vsnprintf((s), (n), __VA_ARGS__)
+#define fprintf_P(fp, ...) fprintf((fp), __VA_ARGS__)
 
 #define pgm_read_byte(addr) (*(const unsigned char *)(addr))
 #define pgm_read_word(addr) (*(const unsigned short *)(addr))