removing microsecond accuracy for now

src/common.h

@@ -537,9 +537,4 @@ static inline void wintype_arr_enable(bool arr[]) {
 /**
  * Get current system clock in milliseconds.
  */
-int64_t get_time_ms(void);
-
-/**
- * Get current system clock in microseconds * 40.
- */
-int64_t get_time_40us(void);
+int64_t get_time_ms(void);