Arduino.h: Remove _min. Is never used.

We want to use _min as literal suffix for minutes_t.

Author: rtrbt

cores/esp32/Arduino.h

@@ -73,7 +73,6 @@
 #endif
 
 // can't define max() / min() because of conflicts with C++
-#define _min(a, b)                ((a) < (b) ? (a) : (b))
 #define _max(a, b)                ((a) > (b) ? (a) : (b))
 #define _abs(x)                   ((x) > 0 ? (x) : -(x))  // abs() comes from STL
 #define constrain(amt, low, high) ((amt) < (low) ? (low) : ((amt) > (high) ? (high) : (amt)))