fix clashing definition of round

cores/teensy4/wiring.h

 #define typeof(a) decltype(a)
 #endif
 
+#if __cplusplus < 201703L
+
 #define abs(x) ({ \
   typeof(x) _x = (x); \
   (_x > 0) ? _x : -_x; \
 })
+#define round(x)                                                               \
+	({                                                                         \
+		typeof(x) _x = (x);                                                    \
+		(_x >= 0) ? (long)(_x + 0.5) : (long)(_x - 0.5);                       \
+	})
+
+#endif
+
 #define constrain(amt, low, high) ({ \
   typeof(amt) _amt = (amt); \
   typeof(low) _low = (low); \
   typeof(high) _high = (high); \
   (_amt < _low) ? _low : ((_amt > _high) ? _high : _amt); \
 })
-#define round(x) ({ \
-  typeof(x) _x = (x); \
-  (_x>=0) ? (long)(_x+0.5) : (long)(_x-0.5); \
-})
 #define radians(deg) ((deg)*DEG_TO_RAD)
 #define degrees(rad) ((rad)*RAD_TO_DEG)
 #define sq(x) ({ \